Transparent TPU Color Changing Watch Strap $ 5.85 Product information: Material: Silicone Color: light turns black, light turns yellow, green turns blue, light turns purple, light turns red Specifications: 42/44mm, 38/40mm, 22mm, 20mm Strap material: silicone Interface type: concave interface Interface size: 22mm Packing list: 1*strap