Yellow Mountain Imports Go Game Set with Bamboo Go Board (2 Inches Thick), Double Convex Yunzi Stones and Bamboo Bowls Bamboo board; weighing close to 15 pounds, this board is made of solid strips of bamboo, pressed together one layer at a time; grid size is 23 x 25 millimeters; the board measures 18.5 x 17.3 x 2 inches (47 x 44 x 5 centimeters); not only is bamboo beautiful, but it is also durable and sustainable; the board comes with a protective sleeve; wood grain may vary slightly from photos; the instructional booklet, "The Way to Go", by Karl Baker is included Reversible; 19x19 playing field on one side and 13x13 on the other; the 13x13 playing field keeps your skills sharp by allowing you to play shorter games when you don't have time for a full length one; you will appreciate the informality and convenience of the smaller playing field; use the 19x19 playing field when you have the time to fully immerse yourself into a standard game Yunzi stones; 181 black and 180 white genuine Yunzi stones; 9.2 millimeter (size 33) double convex stones measure 9.2 millimeters tall and 21.5 millimeters wide (approximately 0.36 x 0.85 inches); 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; the texture, symmetry, and precision of these stones are superior Bamboo wood bowls; a set of two bamboo bowls (gosu) is included; each bowl is 6.3 x 4.3 inches (16 x 11centimeters); these bowls fit stones up to 10.4 millimeters (size 37); securing bowl straps with hook and loop fasteners accompany the bowls to keep the lids secure 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