Soundproofing board for electronic drums. It is placed under the electronic drum set. This is a higher-grade specification, with a metal plate for stable use and high-quality vibration-damping rubber made by Hirakata Giken (Nonbrene) sandwiched in between. It is designed to be used on a flat floor. The soundproofing effect will not be sufficient if the floor is uneven. Due to its dimensions, it is for integrated electronic drum sets. It is not suitable for general drum sets. The board is sturdy enough to be used as a table top and will not warp. Vibration-damping rubber: 10cm square, 1cm thick, hardness 15 Size: 74cm x 46cm x 2cm The board is white, but it is used and has considerable wear, so there are stains in various places. There are also many traces of screw holes used to secure the electronic drum set. Please judge the degree of the stains from the photos. Of course, this is to reduce the vibration sound that is heard through the floor, and it does not make the sound silent, so it does not mean that you can practice even at night in an apartment. It is a product to reduce the annoyance to your neighbors. From the Hirakata Giken page: By making machines and structures sturdy and heavy, they will have a sufficient fundamental frequency to accept all vibrations. Resonance vibration appears in places where a large force is applied, causing major problems. Nonbrene, a vibration isolator superior to vibration-damping rubber, helps with that problem. The biggest feature of Nonbrene is its softness. It has properties similar to gel and excels at absorbing vibrations, so it can be effective against a wide range of vibrations. Nonbrene vibration isolator has 2 to 4 times the vibration isolation effect of conventional vibration-damping rubber and is effective for vibrations in a wide range of frequencies, from low to high. It is especially effective in the low-frequency range, which cannot be eliminated by conventional vibration-damping rubber. Please see the Hirakata Giken website for data sheets, etc.: https://www.hirakata-g.co.jp/product/ns/ By the way, one vibration-damping sheet costs about 5,000 yen, so just four of them would cost about 20,000 yen. Thank you for viewing.