Yellow Mountain Imports Yunzi Single Convex Go Stones (21.5 to 22 Millimeter, Size 3) and Bamboo Bowls Quality of Yunzi stones; this set of professional Yunzi go stones is China's finest; if you haven't played with Yunzi stones before, you'll discover it to be a completely different experience than playing with glass or plastic stones; Yunzi stones have a balance and a deeply rich color that are instantly noticeable; they also leave an audible ''snap'' as you place them on the board; 181 black and 180 white genuine Yunzi stones, 21.5 to 22 millimeters (size 3), included Yunzi stones details; the texture, symmetry, and precision of these stones are superior; these stones are single convex meaning one side is flat with a slight rounding on the edge, and the other side is fully rounded; playing with single or double convex is a matter of personal preference; many go players, however, prefer single convex stones such as these for their feel and much louder snapping sound when played; these stones will fit on Japanese, Chinese and Korean standard size boards Bamboo wood bowls; a set of two bamboo wood bowls (gosu) is included; each bowl is 5.9 x 3.9 inches (15 x 10 centimeters); two securing straps with hook and loop fasteners are included to keep the lids secure during storage and transfer Carrying case; the handy vinyl carrying case will protect the stones and bowls as you easily transport them from place to place 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 The texture, symmetry, and precision of these Go stones are superior. A set of 2 bamboo wood bowls (gosu) is included. 2 securing straps with hook and loop fasteners are included to keep the lids secure during storage and transfer. The handy carrying case will protect the Go stones and bowls as you easily transport them from place to place.