... .40g/cm3 Thickness:2.0-5.0 Felt Factory Manufacture Needle Felt Wool Felt (Factory)100% pressed wool felt Material: 100 % wool, orsynthetic material ... industry, the purification industry and the environmental industry,the felt is a very good filter material,the result was satisfactory ... oil,prevent bad influence in the use and sale The felt can be made into coasters,placemats,ornaments,holiday items, ...