... BV certification 3.100% wool NAMEfamous brand natural white industrial wool felt size1m*1m usually,according to ... protection material;anti-static electricty,seal,dustproof,sound insulation,heat preservationmoisture-proof,cold-resistance,filtrationUseseal, ... dustproof,filtration,sound insulation,heatproofcotton-wadded shoes,shoe pad,inside ...