These coasters are made of cowhide leather. They are 9.5 cm in diameter and about 4 mm thick, made from thick, domestically produced vegetable-tanned leather. The leather is tanned using tannins over a long period, so it develops a rich patina the more you use it. This is a set of 15 coasters. Compared to other coasters I have for sale, these are thinner and the leather is a lighter color. Please comment if you need more than 5. Cups are not included. Please note that there may be some minor scratches due to the natural materials. Thank you. Material...Other