Stone: Birch - LedgeCut33 The number 33 represents the 3″ height and 3 different lengths of 12″, 18″, and 24″ of stone with LedgeCut33. Individual pieces guarantee a natural and authentic appearance which is easy to handle, cut, and install. LedgeCut33 is designed for a dry-stack installation and includes flat pieces and 90 degree corner pieces. Get a Sample of LedgeCut33: http://shop.eldoradostone.com/products/ledgecut33-sample