... / decoration 3.material : polyester,acrylic,etc. poly feltThe felt are usually made in 1.5m x 1.5m sheets ... be made up to 70mm thick.Also for the felt,the Max. width is 1.8m.There is ... no limit of the length of felt. wool feltpoly feltThickness0.5-70mm0.2-30mmdensity0.12g- ... sound insulation, thermal insulation, insulation, heat insulation. poly felt,felt,polyester felt,needle felt