It is woven from high-density nylon, made of high-quality nylon materials, soft and comfortable. The clasp uses a close-fitting velcro, which can easily adjust the tightness without worrying about it falling off during walking and sports. Suitable for Apple Watch 1 2 3 4 5 6 SE generation models. There are many colors and sizes to choose from The colors in the image may differ slightly from the actual colors. Strap size: 38 mm / 40 mm wrist strap, up to 200 mm (7.87 inches) 42mm/44mm wrist strap, maximum 210mm (8.27 inches) on the wrist Note: Apple Watch is not included.