Thank you for viewing! I am selling these because I accidentally purchased the wrong size. Top: 4mm one-sided (probably) Bottom left: 5mm double-sided Bottom right: 4mm double-sided I used each of them for about 2 or 3 test impressions, but there are about 90 pieces in each. The bags are open, but the contents are unused. ★Please purchase only if you understand that these are items stored at home. Thank you for your consideration!