Yellow Mountain Imports Single Convex Melamine Go Stones, 21.5 to 22 Millimeter (Size 3), Includes Jujube Bowls Full set of stones; 181 black and 180 white single convex stones; stones are made of durable melamine for extensive play; the diameter of each stone is approximately 21.5to 22 millimeters (Size 3); dimensions of each stone are approximately 0.22 x 0.87 inches (5.6 x 22 millimeters) Set of jujube bowls; 2 jujube bowls (gosu) measuring 5.9 x 3.9 inches (15 x 10 centimeters) each are included in the set Microfiber cloth; also included in the set are two microfiber cloths to clean and polish your stones and bowls Straps to keep lids secure; a set of straps are included for securing the lids of the bowls during storage and transport 30 day return policy; here, at Yellow Mountain Imports, we want you to be satisfied with your purchase; you are backed by our 30 day no questions asked money back guarantee so you can buy with confidence