Thank you for viewing. This is a 15-color set of uni POSCA PC-5M (round tip 1.8-2.5mm). It's a water-based, opaque marker with good color development, and is a standard POSCA that can be used for a wide range of applications. I accidentally ordered it and have about 16 in stock. Multiple purchases are also possible. If you wish to purchase multiple sets, please let me know in the comments section. These are new, unused, and unopened. Thank you.