This is a pack of two Traxxas Belted Slick Rear Tires, in S1 compound and are intended for use with the Traxxas X0-1. Specially engineered for high-speed use, XO-1's slick tires are the first to be rated for 100+mph (118mph). Zero-stretch belting reinforces the soft-compound rubber, and molded inserts support the tread, assuring 100mph reliability.