The Glass device incorporates a 4 step process of one each 100g nickel bond, 260g nickel bond, 325g resin bond, and synthetic felt discs. The lapidary program is the same with yet another 600g resin disc provided. Ceramic membrane technology is great for liquid filtration and diesel particulate filters (DPFs) http://erickkctu128.huicopper.com/silicon-carbide-crucibles-10-things-i-wish-i-d-known-earlier