Masters Games recommends avoiding plastic stones, if possible. You can play the game with them but you'll miss the experience! All Go stones on this page, unless otherwise stated, are the standard size for Japanese equipment - around 21.5 - 22mm diameter and convex on both sides. There should be approximately 180 stones of each colour in each set. All decent sets have slightly bigger black stones than white. We have sets of stones to suit most budgets and requirements, from glass stones to authentic clamshell and slate sets.