1 Adopt 316L precision-coated shell "fitness" original grade (150 meters waterproof) 2 Citizen Wu Zhu belt comes standard with solid stainless steel double-headed strap and case link 3 Noise reduction and shock absorption inner cover 4 Movement: 100% pure new machine imported from Japan (Type 8215) Case material: 316L stainless steel CNC engraving ultra-precision Table diameter: 41MM thickness 11MM Glass: anti-wear Sapphire crystal, coated with multi-layer anti-reflective coating Steel buckle: double folding safety clasp and push-button Strap: positive 316L steel