4PCS Flash Inline Skate Wheels 90A LED Lighting Skating Wheels 80 76 72 68. Product composition: flash wheel + magnetic core. Colorful flash wheel: with luminous characteristics and brake performance. It is an indispensable wheel for roller skating. Hardness: 90A. Size: 80MM, 76MM, 72MM, 68mm. Suit for: For free skate / slalom / sliding roller skating shoes. Specification: 1. Number of coils: 800 turns. 2. Coil material: pure copper. 3. Material of lamp beads: LED lamp beads. 4. Core material: high magnetic iron. 5. Material of inner buckle: PP plus fiber. 6. Main material: PU. 7. Color: Multicolour/blue/red/white/green(optional). Package List: 4pcs x Flash Skate Wheels