The Schacht 15" rigid heddle comes in 5, 8, 10, 12, and 15 dent sizes. The top and bottom rails are made of maple. The rigid heddle is plastic. Because the slots and holes in the 15 dent rigid heddle are so small, the 15 dent heddle comes with its own slim heddle hook. This rigid heddle is used for both the 15" Flip and 15" Cricket looms.