The 3 piece Wheel Woolies Medium B kit is a great tool for those hard to reach areas of your motorcycle, the wheels in between the spokes up near the engine around the cylinder you know the places were talking about. These brushes come with 8", 12" and 18" sizes. The trim heads come as 1"x 3", 1.75" x 3" and 4"x 5" . With the grips being red @ 5/16", 3/8" and 1/2".