Bonetto Cinturini 20mm Black Rubber Watch Strap Model 270 Imported Made in Italy from high quality, vanilla-scented vulcanized nitrile NBR rubber (not silicone). Will not attract lint or dust Nitrile rubber is waterproof, non-toxic and non-allergenic; resistant to salt and UVA rays Bonetto Cinturini produces OEM rubber dive straps for many of the world's most famous watchmakers Fitted with a 20mm polished stainless steel buckle To determine your strap size, measure the distance (in millimeters) between the lugs of your watch