Spreader Bar expands from 29 to 37 inches. Three easy steps to assemble; instructions inside. Contains: One 14.5 inch center aluminum tube, two 14.5 inch spring locking expanding aluminum tubes, and two cuffs. Spreader bar is made of aluminum, polypropylene, nickel-free metal D-rings. Cuffs made of polypropylene webbing, nickel-free metal hardware, and Velcro, polyester binding.