Formulated for indoor racing. Full-size hub reduces urethane volume; manufacturer emphasizes top-end speed and grip. Made in the USA. Natural material color and small material variations may occur. The current manufacturer page does not specify the sold pack quantity. Confirm quantity with Diamond before ordering. Hardness by color: Blue: 89A; Green: 93A; Red: 95A; White: 97A. Photos show an example variant. Select your size or color where offered; confirm stock with Diamond.