Material: Pure vulcanized rubber anti-UV, anti-dust and anti-allergic Buckle Type: Brushed 316L stainless steel tang buckle Strap Color: Black, Navy, Orange, Green Design to fit: Seiko Mini Turtle SRPC35K1, SRPC37K1 and SRPC39K1 etc 15 resistant pin holes offering flexibility in length DESCRIPTION Crafter Blue CB13 curved end rubber strap is engineered for Seiko Mini Turtle Prospex Automatic Dive Watch SRPC35K1, SRPC37K1 and SRPC39K1 & Seiko Baby Marinemaster (MM200) Prospex Automatic Dive Watch SBC061, SBDC063, SBDC065, SPB083J1, SPB077J1 models, etc.  The rubber band is made of pure vulcanized rubber which has superior strength and more resistant than natural rubber to oils and acids. Material has also met the RoHS requirements and rarely causes severe allergic reaction. It also includes a pair of replacement spring bars for easy installation. SPECIFICATION Lug width: 20mmBuckle size: 20mmBuckle type: Brushed stainless steel tang buckleWrist size 5.2 inches to 8.2 inches / 133 mm to 210 mm Overall Length: 135mm + 75mmThickness: Approx. 6mm - 3.5mm Design to fit : Seiko Mini Turtle SRPC35K1, SRPC37K1 and SRPC39K1 etc Seiko Baby Marinemaster (MM200) Prospex  SBC061, SBDC063, SBDC065, SPB083J1, SPB077J1 models, etc Color / Finish: Black, Navy, Orange, Green Lug end style: Curved End Pin holes: 15 resistant pin holes offering flexibility in length DESIGN TO FIT SRPC35K1, SRPC37K1, SRPC39K1, SBC061, SBDC063, SBDC065, SPB083J1, SPB077J1 WRIST SIZE Wrist size 5.2 inches to 8.2 inches / 133 mm to 210 mm ACCESSORIES Replacement spring bars: included