Roller Skates descriptions： We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. Inline 90a Led Lighting Skating Wheels Flashing Roller. Feature: 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 Includes:  4pcs X Flash Skate Wheels . Products number : SOMONO164390