Clearsonic S3D Sorber - twin pack. Absorber Panel, constructed from Fiberglass encased in heavy-duty dark gray cloth. S3 Absorber can be attached to the inside of the ClearSonic Panel to reduce the amount of reflected sound, or attached to a wall to improve acoustics in a room. They are velcro-receptive and easily attached to almost any flat surface. 33" H x 22" W x 1.5" D Color: Dark Gray. 2 pieces