The Wheel Gerbil is soft thick-haired 100% sheepskin - the same sheepskin collectors recommend for the finest of automobile paints which is now engineered for the superior design and fine finish of wheels. With the prices of wheels going up by the day, protecting your investment involves cleaning with the right tools and the right degreasers but most importantly removing dirt in tough places with a gentle brush that will clean fast without ever harming any wheel surface.