Backyard Discovery Tic-Tac-Toe, Green/Yellow Rolling cylinders with brightly colored markings for each of the game symbols; Attaches to side railings and walls Large, easy to read game pieces Easy to turn so anyone can play. Simple to assemble and mount Metal brackets can be cut for openings from 17" to 22" Backyard Discovery swing set accessories Rolling cylinders with brightly colored markings for each of the game symbols; Attaches to side railings and walls Large, easy to read game pieces Easy to turn so anyone can play Simple to assemble and mount Metal brackets can be cut for openings from 17" to 22"