Series 3 Series 2 Series 1 (38mm) Sport Edition and Nike+ Top Leather iWatch Strap: Premium soft genuine leather band with dark brown PU leather inner lining and meticulous stitching, skin-friendly, comwithtable touch feeling on your wrist Secure Connection Adapters: Sturdy spring adapters to lock into Apple Watch, comes with metal removal tool, easy to install or remove but tight and safe, don’t worry falling apart Solid Classic Clasp: Refined stainless steel buckle with exquisite surface finished, smooth and shiny, thanks to the stable middle pin in the clasp, never worry about it disengages easily Fits Size: Fits 6.5"-7.5" (165mm-190mm) wrist