I am selling these as I didn't end up using them. The size is 52.5mm (thickness) x 800 x 750mm per sheet. Weight is 15kg per sheet. Two sheets are enough to support an upright piano. ※The listed price is for two sheets, but I have seven in total. ※Price negotiations are welcome! ※I will prioritize the first person to purchase, even during negotiations. If you are interested, please feel free to comment.♬