... 3)free samples High Quality of Glass Polishing Wheels for Hats for Industrial UseThe advantage :1. Sound absorption, soft moistureproof, heat insulation ... based on your sample. Product’s NameHigh Quality of Glass Polishing Wheels for Hats UsageFelted wool is used ... ,insulation.Filtration:air,petroleum,water.Polishing:marble,crystal,glass,jadeware,furniture,stainless steel plate.AdvantageThe wool felt ...