The Mueller-Kueps Conical Eraser Kit, No. 282 260/KIT, includes six erasers made from high quality rubber. At 60mm in diameter, the erasers are designed to reduce time spent cleaning rims. Use with an electrical drill, cordless drill or with the Air Eraser, No. 297 013, from Mueller-Kueps. It can be used with multiple speeds on the drill from 500 to 1,000 maximum rpms. If used at proper speed, the eraser will not leave any residue on the rim, the company said. The erasers will not damage or scratch aluminum rims.