Features: Material: Made of PU material, providing better grip, roll and wear, which ensure a smooth and comfortable ride. LED Flashing Wheels: It contains a set of 4 wheels with illuminating LED lights which flashing as it turns. No batteries needed. High Hardeness: This skate wheels hardness is 90A, it is mainly used indoors, not recommended to use on uneven ground. Applicable For: Fit on most kids inline skates, caster boards, and even luggage suitcase. Perfectly suitable for daily practice, recreational, artistic skating and hockey skating, extremely handy and practical. Fashion: Use the flashing wheels will make you look cool and stylish in night skating, give you more fun. Gift: These flash wheels are the best gifts for beginners of children. Specifications: Item Type: Flashing Skate Wheels Material: PU Color: Colorful Quantity: 4Pcs Hardness: 90A Coil Count: 800 laps Coil Material: Copper Light Bead: LED Light Beads Magnetic Core: High Magnetic Soldering Iron Inner Buckle Material: PP Fiber Size: About 80mm/3.15inch, 76mm/3inch, 72mm/2.83inch Package Includes: 4Pcs x Flashing Skate Wheels Notes: Transition: 1cm=10mm=0.39inch 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.