FEATURE: High-quality vulcanized rubber is used for all StrapXPro rubber straps. The rubber formula was scientifically developed for StrapXPro, it is tested and fine-tuned to its maximum performance. StrapXPro rubber watch straps are strongly resistant to sweat, dust, odors, and UV radiation. Our waterproof rubber straps undergo rigorous stretching and tearing tests to ensure their durability; nevertheless, our StrapXPro Watch Straps are FDA, RoHS and REACH-certified. StrapXPro Premier Series rubber watch strap is a creation that craftily offers a 3D bracelet design; the wrist curved angles are precisely calculated to provide an ergonomically comfortable fit. The tailormade StrapXPro Premier Series curved end watch strap fits perfectly with Seiko SKX and New Seiko 5 Sports (5KX/GMT) Prospex watches. The StrapXPro Premium Series is made to use with three-fold clasps, its cut-to-fit design can easily be adjusted to fit all wrist sizes. The special two-tone color designs artistically outlined the extraordinary bracelet shape and structure, the StrapXPro Premium Series stands out from other ordinary rubber straps.MATERIALHigh-quality vulcanized rubber (Resistant to Sweat, Dust, UV, and Odorless)STRAP COLORBlack, Navy Blue, Orange, Army Green, Red, White, Royal Purple, Black/Red, Orange/Black, Green/Black, Black/YellowCERTIFICATEFDA, RoHS & REACH-certified SPECIFICATION LUG WIDTH22mm LUG END STYLECurved endDIVER CLASP SIZE20mmDIVER CLASP INCLUDEOptionalWRIST SIZE4.7 inches to 8.6 inches / 120 mm to 220 mm(With StrapXPro divers clasp)OVERALL LENGTH93mm+93mm DESIGN TO FIT Seiko SKX SERIES SKX007, SKX009 and SKX011 WHAT'S INCLUDED? Watch strap 2pcsCustomized spring bars 2pcs* Use the included customized spring bars for installation.**Watch is not included.