For big chewers…a bag of 32 wood blocks. Natural ash and pine blocks, all pre-drilled with a 5/8" hole for either a skewer or chain. Includes 8 hard ash squares (2-1/4"x3/4"); 8 hard ash rectangles (4"x1-1/2"x3/4"); 8 hard ash triangles (2-1/2"x3/4"); and 8 pine squares (3-1/4"x1-3/8")