Although not shown in the images, there are two more similar panels, making a total of 9 soundproof wall panels for sale. One panel has a square cutout for passing through a power cord. I purchased these on Mercari about 3 years ago. Below is the original description from the seller: --------------- These are 50mm thick sandwich-type soundproof panels made of two 25mm thick pieces of Rockwool (605mm x 910mm, density 80) from Pia Living, with single-sided glass cloth, sandwiching a Daiken soundproofing sheet. The edges are secured with white tape, so repairs can be done by re-taping them. Used for about six months. No pets or smoking. These were made by an amateur. ---------------- Please understand that there are minor imperfections such as crushed corners and dirt. No returns accepted. Hand delivery is also possible, so please comment before purchasing if you prefer this option. In that case, I can discount the shipping fee for the "Tanomeru Bin" service by 5,000 yen. I am located in Takatsu-ku, Kawasaki City, Kanagawa Prefecture. If you are nearby, I can also deliver them by car, so please feel free to inquire.