Wool felt fabric,Eco-friendly Material:100% wool felt Density:0.10-0.60g/cm3, Thickness1-90mm Wool felt fabricWool felt is smooth hand feeling ... , oil seals, insulation, sound proofing, and sound absorption. Characteristic of wool felt: *Eco-friendly.The material of the felt is from ... wool.The wool itself is one kind of the biodegradation,the non-toxic ...