[REDUCE NOISE]: Our 3D acoustically designed 7 inch foam helps break up sound waves providing the perfect level of moderate sound control on walls or ceilings. [REDUCE REVERB]: At 50/lbs per cubic yard, these Bass Trap Studio Foam effectively absorb unwanted flutter echoes. Made up of non- environmentally friendly polyurethane foam at 50/lbs per cubic yard [EXPANDS QUICKLY]: Our foam panels come compressed in a vacuum package and quickly recover to normal size, either by placing in a well ventilated place for about 24-48 hours or soaking the foam in water for one minute then wringing the water out and using a hair dryer or letting it air/sun dry. [PLACE ANYWHERE]: Great for spot treating sound on walls in your studio or office - For use in recording studios, control rooms, Offices home studios, home entertainment theaters, Home Offices. Easy to shape and cut to size, altering 't affect performance. Colour:black Material:Polyurethane Size:18 x 18 x 30cm Package Contents: 6 * Triple-cornered sound insulation sponges Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.