Bello Games Uria Stone Backgammon Checkers Uria stone (same component bowling balls are made of so they will not crack, chip or fade) backgammon checkers. Complete with 15 black and 15 ivory backgammon checkers. For the appropriate backgammon checkers to fit on your board the checkers should not be larger then the widest part of your diamond on the board. They also, should not be any smaller than 1/64". Imported from the Orient.