Product Description: 1. The sponge is of high density, soft and dust-free. The sound effects are suitable for studios and KTV. Because of good acoustic characteristics design, it is able to reduce noise and eliminate the echo, a good choice for home studios and suitable for noise reduction in KTV. 2. It is beautiful in mushroom shape with good acoustic properties. You are free to choose the quantities needed. Product Parameters: 1. Material: sponge 2. Style: European and American minimalism 3. Applicable Scenes: studios, piano rooms, drum rooms, anchorage chambers, home theaters, KTV, conference rooms, instrumentation rooms, etc. 4. Product Size: about 200 * 200 * 50 mm / 7.87 * 7.87 * 1.97 inches Note: Due to different light and monitor, there may be color differences. Installation Instructions: Paste it after spraying dedicated sponge adhesive, and gently press it. Then, it is done. Packing List: 1 * soundproof sponge