25ppi Mesh Foam/Filter Sponge: 1)Excellent filte function 2)Reusable,washable ... cutting equipment, can product various shape of foams. 2.25ppi Mesh Foam/Filter Sponge detail:1)Material: PU (polyurethane)2)Aperture ... )Use: filter dust, air, liquid, equipment filter etc. 25ppi Mesh Foam/Filter Sponge 25ppi Mesh Foam/Filter Sponge 25ppi Mesh Foam/Filter Sponge