Comfortable Material: Made of PU material, which provides better grip, rolled up and wear, ensuring a smooth and comfortable ride. Flashing LED wheels: contains a set of 4 wheels with LED lights that flash as you turn Requires batteries: No Fashionable: Using flashing wheels will make you look cool and stylish on night skating, you will have more fun. Suitable for: Fits most kid's rollerblades, skateboards, and even luggage cases. Perfectly suited for daily practice, leisure, figure skating and hockey, extremely handy and practical. Gift: These flash wheels are the best gifts for children's beginners. Features: Material: Made of polyurethane for better grip, rolling and wear, which guarantees a smooth and comfortable ride. Flashing LED Wheels: Contains a set of 4 wheels with LED lights that flash as it spins. Requires batteries: No High hardness: the hardness of the wheels of this skate is 90A, mainly used indoors, it is not recommended to be used on uneven ground. Applicable for: Fits most kids inline skates, skateboards and even luggage cases. Perfectly suited for daily practice, figure and recreational skating and hockey. Extremely handy and practical. Fashion: Using flashing wheels will make you look awesome and stylish on night skating, bring you more fun. Gift: These flash wheels are the best gifts for kids beginners. Features: Item Type: Flashing Wheels. Material: polyurethane. Colour: multicolored. Quantity: 4 pieces. Hardness: 90 A. Number of coils: 800 turns. Coil material: copper. Bead of light: LED light beads. Magnetic core: soldering iron with high magnetic value. Inner loop material: PP fiber. Dimensions: approximately 80mm, 76mm, 72mm. Package Contents: 4 flashing wheels. Notes: Transition: 1 cm = 10 mm = 0.39 inches 1. The color of the actual item may vary from the pictures, depending on your computer's display and brightness settings. Thank you 2. Since measurements are taken by hand, the sizes indicated may vary by 1-3 cm.