Our innovative design features four, small, space-age plastic feet that allow the A-Frame to sit on slightly uneven ground with greater stability. The frame is made from welded aluminum and finished with one-piece wood skin (3' x 9') on each half. Wood skin and cleats are painted blue with yellow contact zones meeting both A.K.C. and U.S.D.A.A. regulations, using textured paint for good traction. Our top hinge features a rounded exterior and an internal support pipe, providing increased safety for your dog's feet when going over the top. Support chains have sturdy clips preset at regulation heights for A.K.C. and U.S.D.A.A., as well as at 2', 3' & 4' training heights The clips can quickly be moved if you desire other heights above 4'. Aluminum center support unit is included for safe use at heights of 4' and lower. Easy assembly requires no tools. Total weight: 185 lbs.