... , 60, 63.5, 76, 89---- 1. carbon steel, stainless steel, pvc, nylon2. zinc-plating, galvanizing, chromeorplated3. Use press ... gravity roller could be made of nylon, weld pipe, stainless steel. For nylon gravity roller, the color could be ... grey or white.5. Steel gravity roller ... Non-drive Gravity roller (Nylon, steel, stainless steel)