Specifications: These wheels need no batteries, they will flash when rolling. They can provide a faster, smoother and safer skating experience. The skating wheels are made of premium quality polyurethane, durable to use. They are suitable for 608ZZ ABEC-7 bearings. Type: Skating Shoes Wheels Quantity: 4Pcs Material: Polyurethane, Copper Features: with LED, Durable, Good Replacement, Eco-friendly Diameter(Optional): 76mm/2.99", 80mm/3.15" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 4 x Skating Shoes Wheels These wheels need no batteries, they will flash when rolling. They can provide a faster, smoother and safer skating experience. The skating wheels are made of premium quality polyurethane, durable to use. They are suitable for 608ZZ ABEC-7 bearings. with LED, Durable, Good Replacement, Eco-friendly