1 pack - 4 wheels 65x37 Purple Atom Pulse offers the best ride in an outdoor quad wheel on the market today! Outdoor Quad Wheels Features: Size: 65mm x 37mm; Hardness: 78A; Surfaces: Sidewalk, Boardwalk, Asphalt; Technology: Hollow Core Technology If you're looking for wheels to skate on hard or rough outdoor surfaces, look no further! The Atom Pulse is one of the most popular wheels for skating outdoors because they are soft enough that you don't feel every bump, but roll as smoothly as any other hybrid wheel. These awesome wheels come in a variety of colors so you can get that custom look you crave!65mm x 35mm78A Hardness