Usage Tips:[What's Different]The biggest difference with other acoustic foam on the market is that our acoustic foam panels comes with self-adhesive. Are you still worrying about finding tape everywhere? If you ever try our soundproof foam before, you would know how easy to install. [Thicker is Better]Achieve the sound absorption and reflection with our 2-inch thick pyramid-shaped soundproof wall panels, achieving maximum surface area for the utmost sound control. Easy to shape and cut to size, customizing the shape you like and won't affect performance. [Enhances Sound Quality]2 inch pyramid 3D acoustic design provides moderate sound control on walls or ceilings. High-density materials its tiny particles design which are effective to absorb noise and eliminate echoes. [Easily Cover Large Areas]12 Pack Covers 12 Square Feet - Each tile is 1 square foot of 2 inch thick acoustic wedge. Get more coverage more quickly! Perfectly suited for small to medium size rooms, recording studios, home theaters, or general sound reduction. size:30x30x5cm Material:Polyurethane colour:black Package Contents: 12 * studio foam Only the above package content, other products are not included. Note: Light shooting 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.