Thank you for viewing! (^_^) These are soundproofing materials I was using at home. I purchased them on Mercari before. I'm selling them as a set of 10. The size is: 25 cm long, 25 cm wide, 5 cm high. Since I had them stuck up at home, there are traces of adhesive and staples. How about purchasing them if you want to try them out? I will pack them tightly and ship them as small as possible. Please refrain from purchasing if you are sensitive to such things. For those who understand. *Price reduction is only for combined purchases of items in the store.