Hardness 82A: Give you long-lasting grip whether on a rink, sidewalk, or street. High Performance: Smooth, comfortable, and durable, allowing you to find more fun. Applicable Usage: Suitable for double-row skating and skateboarding, rollerskates. Material: Made of PU and PP material, durable, the light is bright and not dim. Occasions: Suitable for many occasions, indoor, outdoor, asphalt roads, parks. Specifications: Material: PU+PP Color: Colorful, White, Blue, Red, Pink+Purple Size: About 5.8x3.2 cm/2.28x1.26 inches(Diameter*Width) Bearing: high speed 608RS Kernel: LED light Hardness: 82 A Application: Double roller skating, skateboard Resilience: 80% Package Included: 4 x Luminous Skateboard Wheels Note: The bearing needs to be pressed tightly for the product to emit light, otherwise it will not emit light.