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- Bonetto Cinturini 300L Rubber Watch Strap - Black
Bonetto Cinturini 300L Rubber Watch Strap - Black
Double Face construction. Italian-made NBR rubber. Steel deployant clasp.
Model 300L is the smooth side of Bonetto Cinturini’s Double Face 300 series. The reverse side (300D) is textured. The strap can be flipped by removing the spring bars, giving two distinct looks in one design.
The strap uses a deployant clasp rather than a traditional buckle, creating a clean, continuous profile with no loose tail. The brushed steel clasp with polished safety lock adds structure and keeps the look balanced on the wrist.
Material & feel
Made from vulcanized NBR rubber, the strap has a firm, dense feel with controlled flexibility. At 4mm thick, it carries more presence than slimmer rubber straps but remains comfortable once shaped to the wrist. The smooth side offers a simpler, flatter look against the case, while the reverse textured side adds depth.
Carries a light vanilla scent, typical of Italian-made vulcanized rubber.
Sizing & specs Length, taper, spring bars, buckle finish and more
Length:
87mm / 87mm (fits wrists 6.25–8.0in)
Taper:
- 18mm lug / 18mm buckle
- 20mm lug / 18mm buckle
- 22mm lug / 20mm buckle
- 24mm lug / 20mm buckle
Fit guidance
Fit is adjusted by trimming the strap at the clasp end using the pre-set pinholes. Because there is no traditional tail, proper sizing depends on trimming and clasp alignment. Accommodates spring bars up to 1.5mm in diameter. For step-by-step cutting instructions, see our Bonetto Cinturini sizing guide.
Popular watch pairings
20mm strap width fits:
- Glycine Combat Sub 39
- Hamilton Khaki Field
- Omega Seamaster Diver 300M
- Omega Speedmaster Professional
- Rolex Submariner
- Sinn 104
- Tudor Black Bay Fifty-Eight
22mm strap width fits:
- Orient Kamasu
- Orient Ray II
- Tudor Black Bay
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 $49, or $5.95 on orders up to $49. 3 to 6 business days.
- USPS Priority Mail: $9.95. 2 to 4 business days.
- USPS Priority Mail Express: $25.95. 1 to 3 business days.
International
- USPS First Class International: $17.95. 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.
