Jewelers use MX Wheels. Excellent for fast grinding and sprue removal leaving a smooth even finish. A laminated cotton fiber composite in a rubber bond uses aluminum oxide to give a long lasting abrasive wheel. MX wheels cuts and smooths in one step. The cotton fibers provide cushioning to eliminate vibration and snagging while polishing and grinding. Wheels can be shaped to fit your need. Use 80 grit for deburring and sprue removal, 120 grit to remove parting lines and small burs, 180 and 320 grit for removing light scratches.