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