The "CJ" frame is made of 1 5/8 inch O.D. schedule 40 pipe. It has a wide tip resistant design which is welded for rigidity and then hot-dip Galvanized after fabrication. Top and seat cleats are 2 x 2 x 3/16 inch steel angles. Center cleat is 1 1/2 x 1/2 inch steel channel which provides level top and sturdier attachment of the 1 5/16 inch Galvanized cross braces. Purchase with your choice of planking.