There are 11 pieces of black material, half an inch as the title says. I would greatly appreciate it if you would look at the photos and read these descriptions. If you have any questions, please send me a message and I will be happy to answer as soon as possible. The numbers are almost invisible where they are painted green, but they are in good condition. 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm,20mm