For TicWatch Pro/GTX Bi-Color Silicone Watch Band Watch Strap with Breathable Holes - Black / Grey Made of premium silicone material, it is not harmful and not allergic to human skin The strap is thickened, which makes it more comfortable to wear and easier to use Waterproof, sweatproof, comfortable and soft Multiple holes design for easy adjustment of size An ideal strap replacement for your old, broken one Specifications: Material: silicone Wrist circumference: 5.7-8.9 inches Length: 96+140mm Compatible with: TicWatch Pro/GTX Package included: 1 x Watch Strap Other items not included