This is the Multi Wheel Balancer in Black from Muchmore Racing. For buggy and touring car wheels Easily balances wheels ensuring optimal tire grip for acceleration and top speed and greater fuel or battery efficiency Two way holder is designed for all types of wheels-non-grooved side is for metric (mm) type of wheels like Muchmore, Yokomo, HPI and others, grooved side is for imperial (inch) type wheels like Losi and Associated Magnetic caddy at bottom to store shaft when carrying Multi Wheel Balancer in Black with instruction sheet from Muchmore Racing Fitting wheel to shaft and spinning 3.9 x 3.1 x 3.1" (100 x 80 x 80mm) Weight: 5oz (142g) jxs 10/07/08 ir/jxs &