Description: Applicable to POLAR Boneng M400 M430 Smart Watch Universal Silicone Strap With Tools Size: Small 213mm Large 236mm Material: Silicone Color: black, white, orange, pink, red, gray, orange, rose, sky blue, purple Process: This product is made of silicone material, waterproof, sweat-proof, comfortable and soft. The strap is thickly designed for comfortable wearing, easy to use and high quality. The material is harmless to human skin, environmentally safe and not allergic. Adapted to the original POLAR Boneng M400 M430 smart watch Product size: large size for men, small size for ladies Specifications: Applicable to POLAR M400/M430 official with the same paragraph solid color silicone strap breathable replacement wristba Package Included: 1* strap