These high-grade, brand new  Acid Chemical wheels are built to last! They measure 55mm in diameter and 86a in hardness, providing a super smooth ride. Whether you're cruising over gravel or filming a dope skate video, these softer wheels will help you dominate your goals like a smooth operator. Acid Chemical Wheels Pods Conical White Skateboard Wheels - 55mm 86a (Set of 4) are sold in (1) set of four (4) wheels.