Wheels come in a variety of shapes and sizes, made of urethane, and are sold in sets of four. Before making a purchase, factors such as size, shape, and durometer (hardness) should be considered if you want your wheels to adequately suit your skating style. For example, small wheels (around 50-54mm) with a high durometer (99+) would better serve technical street skaters looking for a lightweight setup that can slide on different surfaces. On the other hand, big wheels (55mm+) with a low durometer (under 90) would be more suitable for all-terrain cruisers that can tackle rough surfaces and maintain speed easily. Each option has its benefits and drawbacks, so if you are unsure which is right for you, do not hesitate to get in touch.