... .40g/cm3 Thickness:2.0-5.0 Felt factory Needle Felt Wool Felt (Factory)100% pressed wool felt Material: 100 % wool, orsynthetic material ... . Make the metal products and machinety be wrapped in the felt,when transport and storage prevent scratched and stained oil,prevent bad influence ... clothes, industry produce, normal machine, chemical, electrical, construction, steel and other industrial distric.