Lapidary Glass felt sanding belts are used to sand and polish the surface of gemstones, glass, and wood. They go on expandable drums and polishing heads. Shop our collection of diamond and silicon carbide sanding belts from top brands like Covington Engineering, Barranca Diamond, and Cabking.These high quality felt belts are designed for use on our Covington Sanders or expandable drum wheels. Use with cerium oxide to receive an optical polish. Once belt is charged, apply cerium oxide as needed.