Super Special formula grippy Urethane, Blue anodized aluminum hub, Indoor race formulation Full size Aluminum Hub with less Urethane for greater top end speed – the fastest wheel in the world. With intense grip and the ultimate in speed, the Shaman Wheel is the #1 indoor speed wheel. Aluminum anodized hub is designed to withstand bearing oil corrosion and thermal heat. Low profile wheel radius results in high velocity performance that is unmatched in the industry.