what are skateboard wheels made of

Skateboard wheels are made of polyurethane, a type of plastic that can be manufactured in varying degrees of hardness. Polyurethane replaced the old metal or ceramic wheels and brought a revolution in terms of grip, durability, and shock absorption. The most professional skateboard wheel molds are made of aluminum and are so precise that after molding new wheels, they barely need to be cut. The creation of skateboard wheels starts with computerized designs, guiding cutting tools to carve solid aluminum pucks. The aluminum pucks are then heated and pressed into the desired shape, and the polyurethane is poured into the mold. The wheels are then cured in an oven and removed from the mold. Skateboard wheels are available in different sizes, various hardness levels, a plethora of colors, and unique graphic designs. The hardness of skateboard wheels is measured in durometers, and they typically range from 75a to 104a, with softer wheels providing a more comfortable ride and harder wheels providing better maneuverability.