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Radar Shadow Indoor/Outdoor Roller Skate Wheels 62mm / 80a - This wheel is perfect for smooth concrete or dirty tile surfaces when you must have grip. Because the hub is urethane, there are no debonding issues even with the softest material on the market. Recommended for super slippery indoor or any outdoor, asphalt or otherwise rough track that would eat standard indoor speed wheels.Features- The Shadow is perfect for slippery concrete, dirty tile, or ANY surface where you are having a hard time getting grip with other wheels. We call them ?Hybrid? Wheels because they can also be used for outdoor skating. Shadow wheels roll faster than all others that claim the same grip.- Surfaces: Coated and Uncoated Surfaces- 62mm x 43mm- 80A- Nylon Slotted- Bearings and spacers sold separately