The 4-pack California Locos X Mister Cartoon Irons wheels are designed for skateboards. Constructed from high rebound urethane, these wheels provide an excellent sensation beneath your feet. The smaller 52 mm wheels are ideal for street setups, offering pop and balance. In contrast, the medium-sized 54 mm wheels are versatile, suitable for street, park, and small ramps. The durable and long-lasting California Locos wheels with hardness ratings of 97A and 99A are perfect for sustaining speed and ensuring firm trick landings.