Love to cruise? These brand new Seismic wheels are built to last! Measuring 60mm in diameter and 97a in hardness, they pack a super smooth ride. Over gravel or while you film that dope skate video that'll put you on the map (go ahead - all of us at Warehouse Skateboards will wait), these softer wheels help you dominate like a smooth operator. Seismic Skate Systems Booster White / Blue Skateboard Wheels - 97a are sold in (1) set of four (4) wheels.