This is a set of two AKA Racing "HEXlite" 2.2 12mm Hex Rear Wheels, and are intended for use with Associated TLR/Losi and Kyosho 1/10 2wd and 4wd buggies that use a 12mm hex rear wheel. . that use a 12mm hex rear wheel. How do you reinvent the wheel? Make it lighter and more durable! AKA HEXlite 1/10 buggy wheels were designed with two things in mind, weight and durability. Both were achieved through superior engineering and use of AKA's proprietary high-impact nylon. This combination makes them one of the lightest hex wheels on the market. Plus, HEXlite wheels spin true and balanced thanks to the "made in the U.S.A" quality craftsmanship. Also, a revolutionary feature to the 1/10 market is the optional wheel stiffener insert (Not Included). It has been designed to stiffen the already stiff wheel, as well as help prevent dirt from building up inside the wheel, which will cause the wheel to go out of balance.