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Model 300D is the textured side of Bonetto Cinturini’s Double Face 300 series. One side carries a fine geometric texture, while the reverse (300L) is smooth. 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.
Double Face construction. Italian-made NBR rubber. Steel deployant clasp.
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 textured side adds visual depth, while the smooth reverse offers a simpler, flatter look against the case.
Carries a light vanilla scent, typical of Italian-made vulcanized rubber.
Thickness: approx. 4.0mm
Sheen: Matte
Buckle: Polished stainless steel
Taper by size:
Spring bars: Standard (free pair included)
Apple Watch: 22mm fits Apple Watch (with strap adapters).
Model 300D is designed to be worn with its folding deployant clasp, creating a centered, symmetrical fit when closed. The two equal-length pieces keep the clasp positioned cleanly under the wrist.
Fit is adjusted by shortening 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. For step-by-step cutting instructions, see our Bonetto Cinturini sizing guide.
This strap accommodates spring bars up to 1.5mm in diameter.
For a deeper look at how rubber straps behave on the wrist, see our guide to rubber strap fit and comfort.
Length & wrist size:
87mm / 87mm (fits wrists approx. 6.25–8.0in)
Measurements exclude the buckle.
Water exposure: Waterproof, designed for prolonged water exposure including swimming and diving.
For routine care, rinse with lukewarm water and mild soap as needed. Rinse thoroughly to remove residue. Avoid solvents, petroleum-based cleaners, and abrasive materials, as these can damage the rubber. Dry with a soft cloth and allow the strap to air dry completely before wearing.
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.
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