All Zombie wheels are made in the USA.  Zombie wheels feature anodized aluminum hubs for maximum durability and precise feel while maintaining rock solid stability. This allows our unique urethane compounds to deliver all your power to the floor.  Choose the Zombie combination that fits your skating style and surface.  Pre-packaged in sets of 4. The specs: Zombie 62mm Max – 42mm full width wheel design for maximum grip and stability. Zombie 62mm Mid – Slimmer 38mm width for increased lateral response. Zombie 58mm Low – Smaller 58mm outer diameter and slimmer 38mm width wheels provide instant acceleration and increased lateral response. 89A Purple Core – Polished concrete and other slippery surfaces for insane grip. Can also be used as a pusher wheel. 92A Black Core – For use on coated surfaces and tile. Loaded with an insane mix of grip and speed. 95A Red Core – For use on sticky surfaces, track, or soft skate court where a hard wheel is desired for increased roll