Crafter Blue CB12 curved end rubber strap is engineered for Seiko Turtle Prospex Automatic Dive Watch SRP773, SRP775, SRP777, SRP779 models, etc. Crafter Blue CB12 rubber band is made of pure vulcanized rubber which has superior strength and is more resistant than natural rubber to oils and acids. Material has also met the RoHS requirements and rarely causes severe allergic reactions. Accompany with well-built stainless steel buckle and a featured big keeper. It also includes a pair of replacement spring bars for easy installation.