This is a large soundproof panel. For details, please check Itomasa's Shizukane DX. It was used for about a year and a half. In reality, I only placed it behind the piano after purchasing it, so it hasn't been used much. It's large and shipping seems troublesome, so I'm thinking of taking it to a recycling shop, but I'm listing it for a limited time just in case. Thank you for looking.