HDT Bonetto Cinturini Rubber Material Strap Model 303 [22mm] Rubber strap with 3 dimentional pattern to match with many elegant to sporty watches. Will last you years without becoming brittle or forming cracks, unlike silicon. Made by Rubber Strap manufacturer in Italy who supplies to many well known Swiss Watch Manufacturers. NBR 217 Vulcanized Rubber  Anti-allergic and non-toxic