BoatFramer components are injection-molded rugged ABS plastic. All assembly parts are stainless steel. The basic materials needed to cover a small boat up to a length of approximately 22 feet are included in the basic kit, BK1. Details may be found in the BK1 Parts List. Longer boats require adding a Single Bay (SB1) kit for each additional four feet of boat length. For in-mast storage, a MK1 Mast Kit is required.