These lightweight polycarbonate wheel-disks are mounted on the outside of the 1/10 scale wheels and create additional rear end grip.
They come in carbon print design and in clear version. You can ofcourse paint the clear one, in same stule and color as your body, or leave them clear.
Fit all popular brand wheels.
The disks come as sheets, so you can cut to required size, as small differences between wheels exist. A circular cutter is handy.
Best to use a wheel-nut with serrated flange surface, to avoid the wheel comes loose. This one works well: http://www.xceedrc.com/product/103330