... office and so on.Backing:pvc foamed back or pvc closed back.Color:orange, red, blue,green,teal,gray ... .45/0.75mmDimention:For foamed back 20.0m(L)*2.0m(W)*2.6/3.0 mm ... (T)/rollFor solid back 20.0m(L)*2.0m(W)*1.6/1.8/2 ... structure more stable.4. For the foamed back, high quality of the bottom layer makes ... good performance in sound absorption.For the closed back, high quality of the closed bottom layer ...