We have two kinds of quality for this Model, one is Merino Wool felt, and the other is Our Local wool Felt. Product’s NameWool feltUsageFelted wool is used in mechanism, aviation, shipping, train, auto, metallurgy, chemical, industry, textileindustry, seal, dustproof, cushion, quakeproof, heat preservation,heatproof,sound insulation, fire retardant,insulation.Filtration:air,petroleum,water. ...