100% Polyester Fiber HIGH DENSITY ACOUSTIC PANELSHIJIRH Latest Pro Grade acoustic panel is unique in the market. 10 times better than foam! Made of high density polyester fiber. We pursue perfection and only choose materials with the highest density! PRO GRADE & HIGH QUALITY,non - slip,colorfast. You can be completely insulated from excessive noise indoor and outdoor. 16 Pcs Pro Grade sound proof panels,you can also use as a bulletin board,multi-purpose,more cost-effective. EASY INSTALLATIONNo special tools or materials are needed when installation,just peel off the coating on the back,place the felt soundproof board in your favorite position,press hard for a few seconds,and it will stick to the wall tightly. Each acoustic board size is 12x12x0.4 inch.Suggest to cover 75% of the wall area for a better sound insulation. WIDE RANGE APPLICATIONDifferent from acoustic foam panels, HIJIRH art acoustic allows you to leave countless beautiful memories