This 4-pack of GFW-ACPNL1212P acoustic foam pyramid panels are 2" thick acoustic foam 12"x12" pyramid panels that improves the acoustics of a room by absorbing unwanted reflected noise and echo during recording playback and mixing. Great for recording and listening spaces, including podcasting, broadcasting, streaming, home studio, drum room, control room, vocal booth, rehearsal space and similar applications.  The 3D Pyramid Design provides ample surface area for maximum sound absorption.