This NBR rubber watch band with a curved solid end piece perfectly fit Seiko Samurai Prospex Automatic Dive Watch SRPB51, SRPB09 and SRPB53 models, etc. Pure vulcanized rubber has superior strength and more resistant than natural rubber to oils and acids. Material has met the RoHS requirements and rarely causes severe allergic reaction. Accompany with well-built stainless steel buckle. This item also includes one pair of custom made 1.78mm spring bars for easy but secure installation. Pure vulcanized rubber watch strap is a good choice of Seiko replacement watch band for your Seiko Samurai SRPB51, SRPB09 and SRPB53 models.