Material: high quality silicone material, special surface treatment, waterproof and sweat resistant, comfortable feel This strap is specially compatible with Swatch's second-free watch, which can replace Skin series SFK397 SFK360 SFK361 strap Soft, light, comfortable, with several colors to choose from Suitable for wrist circumferences from 110mm to 200mm, with 8 holes for resizing, with enough dimensions to adjust length You can get: 1 set of belts, 1 set of tools, 2 spring bars. Free tools: help you quickly install DIY in a short time