Piston Skateboard Wheels 52mm/Diagram It slides fast and smooth, it also features a grippy edge that helps going downhill.• High inside edges to lock into grinds.• Set of 4 Wheels: Most common skateboard wheels that are suitable for beginners when playing short longboard or cruising.• Every Wheel Goes Through Strict Quality Control.• Feel free to ride on all kinds of ground, ramps, sidewalk, smooth concrete or asphalt.• Perfect design that makes your board unique and irreplaceable. Wheel Size: 52x30mm, Durometer count: HR-99A PU wheels