Today, I watched How its made-Skateboard Wheels. Polyurethane wheels were really good because the shock-absorption was improved, and it was a lot more durable. When they formed the mold of the skateboard wheel, they used moldability. Also, after they baked the wheels, they had to make sure that it was strong enough. Along with that, when they used the shape cutter, they deformed the shape and that was malleability.