Double Side Adhesive Included - Our unique groove acoustic panels comes with sticky double side tapes which work well with walls. It's very easy to shape and cut to size, even a green hand can mount these sound panels onto the wall or ceiling Unique 3D Groove Design - These acoustic foam panels are cut in a unique pattern so they definitely stand out in comparison to traditional acoustic foam. Also they are cut well such that they all line up perfectly to each other. The groove design of panels has a contact area with sound which means it inherently traps a surprising amount of sound. Just place these panels where the sound waves would hit them like in front of the speaker or voice. Specifications - These black acoustic panels are 12 x 12 inches in length and width, and 2 inches at their highest point. Every package comes with 12 pack panels which covers 12 sq ft, while each single panel covers 1 sq ft. They came 2 panels mirroring each other. they are high density - 25kg/m3, flame retardant, and made of non- polyurethane foam, no health risk. Rapid Expansion - These panels come in a compressed sealed bag, usually they puff up to full shape and size quickly once you separate them from each other and let them sit for 24 hours or so. If you are in a rush to mount them, use a hair dry to speed the expansion process. Wide Application - These panels do bring down unwanted echoes, natural reverb and high frequencies bouncing in the room when recording vocals or some acoustical instrument. Colour: Black Material: Polyurethane Package Contents: 12 x Soundproofing Foam 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.