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Bonetto Cinturini 306 Rubber Watch Strap - Black

Made in Italy from vulcanized NBR rubber. Waterproof, UV-resistant, and nonallergenic.

$45.00
Strap width:20mm
Ships same or next business day • Free U.S. shipping over $59 • Easy 60-day returns

Model 306 takes a more restrained approach than Bonetto’s traditional dive designs. It features a smooth, streamlined profile with gently beveled edges and minimal surface detailing, giving it a cleaner, more contemporary look on the wrist. The evenly spaced adjustment holes keep the appearance simple and balanced rather than overtly sporty. This is one of the most understated rubber straps in the Bonetto range. It works especially well on modern tool watches and everyday sports watches where you want the durability of rubber without heavy dive-strap styling or visual bulk.

Material & feel

This strap is made from vulcanized nitrile butadiene rubber (NBR), selected for its durability, flexibility, and resistance to seawater and sunlight. The vulcanization process strengthens the material while maintaining controlled flexibility, allowing the strap to bend naturally without feeling soft or unstable.

Compared to Bonetto’s wave and ladder styles, Model 306 feels smoother and more uniform on the wrist. The beveled edges reduce visual and physical bulk, giving the strap a comfortable, low-profile feel that sits cleanly against the wrist. The matte surface resists lint and dust more effectively than many silicone straps and maintains a tidy, modern appearance.

Carries a light vanilla scent, typical of Italian-made vulcanized rubber.

Learn more in our Rubber Watch Strap Guide.

Sizing & specs Length, taper, spring bars, buckle finish and more
Length:
125mm / 75mm
Measurements exclude the buckle.
Fits wrists:
7.0–7.75in

Taper:

  • 20mm lug / 18mm buckle
Spring bars:
Standard (free pair included)
Buckle:
Polished stainless steel
Thickness:
4.8mm→3.5mm (lug end to buckle)
Sheen:
Matte
Fit guidance

Model 306 has a smooth surface and beveled edges that help it wear flatter and slimmer than more heavily sculpted dive straps. Accommodates spring bars up to 1.5mm in diameter.

Popular watch pairings

20mm strap width fits:

Wear & care

Swim ready, suitable for swimming and regular water exposure.

Clean with lukewarm water and mild soap as needed. Rinse thoroughly and allow to air dry fully. Avoid solvents, abrasives and petroleum-based cleaners.

About the brand

Bonetto Cinturini is an Italian manufacturer with more than forty years of experience producing rubber watch straps for professional and everyday use. The brand specializes in straps made from vulcanized nitrile butadiene rubber, selected for its durability, flexibility, and resistance to seawater and UV exposure.

Bonetto Cinturini straps are widely used by watch manufacturers and enthusiasts who value long-term performance, comfort, and straightforward, functional design.

Shipping

Orders placed by 2:00pm PST on business days typically ship the same day.

Tracking is included with every order and emailed at shipment.

United States

  • USPS Ground Advantage: free on orders over $59, or $6.95 on orders up to $59. 3 to 6 business days.
  • USPS Priority Mail: $11.95. 2 to 4 business days.
  • USPS Priority Mail Express: $28.95. 1 to 3 business days.

International

  • USPS First Class International: $18.95. 10 to 21 business days.

For complete shipping details, see our Shipping Policy.

Returns & exchanges

Unused items may be returned or exchanged within 60 days of purchase. Please contact us before sending an exchange.

For full return details and instructions, see our Returns Policy.

  • 5 stars: 27 (84%)
  • 4 stars: 4 (13%)
  • 3 stars: 1 (3%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
Some of the reviews shown are from related products the merchant grouped with this one.
G
G.P.
Almost perfect

This is smooth, nicely finished quality rubber. Tasteful lines, the style and the grey color look great with the Hamilton Khaki Field Mechanical. One minor thing: the strap would be more flexible/comfortable if it did not get thicker towards the lugs, hence the 4 star rating.

As always, fantastic service from Holben's. They are my go to for straps, I don't even bother looking elsewhere.

K
K.Y.
Bonetto rubber

Great rubber strap for any watch. Nice quality smelling like vanilla. Highly recommend these straps.

E
E.B.
All day, every day!

Awesome strap, I wear it every day with my Seiko SPB143. Had a hard time putting the fat seiko spring bars in. Really like the scent of the strap.

L
L.1.
BEST rubber straps on the market!!

The straps are really well made for its pricepoint, very supple and comfortable on the wrist. The vanilla scent smell is strong but pleasing.

I highly recommend these for anyone looking to spice up their watches.

J
Jeff T.
Very soft and great smell

For a 4.75mm strap it is VERY soft, pretty much all other rubber or silicone leave me with a red mark on my skin but this one does not. It’s very comfortable, I hope the smell doesn’t wear off soon, and I’m definitely going to order a black one.

C
Customer
Fantastic Strap

Bonetto Cinturini always makes high quality straps - I'm super happy the strap and aesthetic with my watch.

G
Gary G.
Looks Great On Sinn U50

Bonetto makes a great strap and it smells like a vanilla Isofrane too! Didn't want a quick release strap that has a chance to fail. This strap fit well on my Sinn U50 and I know its secure with replaceable spring bars. Great service too!

A
Andrew C.
Quality rubber, great finishing!

Picked this strap up for my Nodus. The rich blue of the strap really makes my white dial and steel bezel pop. I think the strap is perfect in terms of quality and finish. The sloped design / lines on this strap model give it a great little extra flair.

J
Jason K.
Robust Rubber

If you're looking for a heavy duty rubber strap this one may be for you. The quality and robustness is apparent right away. It is quite thick so IMO it pairs best with a diver but to each their own. I'm docking it one star because it isn't the most breathable strap. The underside is completely flat and has no grooves or channels so I find myself loosening the buckle to the next hole when my wrist gets too sweaty. All in all a great strap but something to be aware of if you're going to be out in the sun and doing anything active.

J
Joshua F.
Really nice strap, but thick

I actually got this one in two colors because I had heard great things about the brand, originally because I wanted a red strap (and thought having a black one would come in handy). They smell really nice and are smooth and soft rubber, on par with the nicest OEM’s I have and leagues above something like stock seiko silicone. My only qualm is that they are simply too fat to fit the watch I was going to put them on comfortably (smiths everest), but this seems more like the lug spacing is small than the strap being unusually large. For now im going to keep them in my strap drawer because they are genuinely quite nice and impressive for the price, and I know the standard 20mm will be versatile and come in handy

m
m****g

Professional seller, Bonetto dive straps are the best! A++++++++++++

T
T.G.
Gray

Classy dark gray color, very substantial a bit on the less pliable side-i put in very hot water to make it more flexible at the wrist bone areas.

m
m.e.
Bonetto Cinturini rubber straps

These Bonetto Cinturini rubber straps are the best rubber straps I've found in this price range. They just fit perfectly and are super comfortable. Some people comment about the vanilla-like smell of the straps, but that smell goes away over time. I've bought several of these, I think they are fantastic, and the service from Holben's is always top notch. I receive my order quickly in about 3 days.

N
N.W.
Smells Too Strong

For the price it was decent but now I know not to buy this brand. The vanilla smell is incredibly strong. I had to throw it away because it gives me a headache.

Thanks for sharing your experience. Bonetto Cinturini rubber straps have a light vanilla scent, which can be more noticeable for those who are sensitive to it.

a
adasut0

Awesome quality and fast shipping - plus great vanilla smell!

J
Jaime
Improvement on original

These product's are top notch and definitely I recommend anyone to buy them. They are an improvement over the original straps.

M
Mike
Smells like vanilla

Great watch band. Smells like vanilla, so if you do not like that smell then this is not the band for you.

J
Jag
High Quality Real Rubber Watch Strap.

Excellent quality. Real natural rubber. Very confortable. Very different from silicone straps. Excellent customer service by the seller.

T
Tech n.
Really high quality genuine Italian rubber strap! Excellent!

If you want a nice thick genuine Italian rubber strap that is soft and flexible this is it! I have bought several straps to fit a dive watch and a pilots watch I have and most have been too cheap or too expensive and the quality does not always equal price.

I finally found these which was a gamble. I was about to buy straps from Marathon but I like these better and they were cheaper.

The seller shipped super fast. Overall very happy with purchase. Highly recommend!

a
anthony j.n.
Absolutely outstanding strap!

After a bunch of research I determined that most OEM straps were being made by Bonetto Cinturini. I could care less if the clasp has a logo on it or not so I decided to try one from Holbens. VERY impressed with the quality of the strap. 6 months later it still looks brand new. I have paired this strap with everything from a SKX to a Planet Ocean and it works well. Why pay more?!

A
Amazon C.
My preferred brand of rubber straps.

Great vulcanized rubber straps at a reasonable price.

G
Garrick
Soft Italian rubber, much higher quality than most OEM rubber straps

Bought this particular one for a friend whose strap had broken on his diver. I've owned a number of Bonneto Cinturini Italian rubber straps over the years, and they are by far the best rubber straps on the market for the price. If you have ever had the pleasure of owning an ISOfrane strap (which sell for well over $100 each), you will immediately feel the similarities.

v
vernon
excellent quality

better than silicone

L
Leigh T.
Great natural rubber band.

It still smells lick vanilla after a year and it's a great natural rubber band. Can't do better for the money!

s
stefan a.k.
well worth the money

this thing feels amazing, i wear it every day, replaced the silicone band on a $100 watch and it now feels like a much more expensive watch

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