The Piper Griffin Brothers Alloy Wheels 4pk brings serious performance to indoor skating sessions. Made from Piper's unique, high-quality Super G urethane, these wheels use a sturdy Galactic Alloy core to give you serious energy transfer and durability, whether you're jamming, shuffling, or just cruising around. A tall 63.5mm height and 42mm width makes for efficient, stable rolling with a 95A hardness that's made to move on rinks and other slick surfaces.