This is a double-sided release paper type seal backing sheet. A5 size Size: 14.6cm x 21cm Sold in a set of 20 sheets. *If you would like the same size as the semi-transparent seal backing sheets I sell, or if you would like the corners rounded, please let me know via message ⟡˖· Also, if you purchase these together with the semi-transparent seal backing sheets, you will receive a discount on shipping. Due to rising material costs, the price has been increased from before. We apologize for the inconvenience. Thank you for your understanding. Thank you.