Sportsheets Expandable Spreader Bar and Cuff Set. Expands from 29-37â  . 3 easy steps to assemble! Instructions inside. Contains: 1, 14.5â   center aluminum tube . 2, 14.5â   spring locking expanding aluminum tubes. 2 cuffs. Spreader bar made of: aluminum, polypropylene, nickel free metal D-rings. Cuffs made of: polypropylene webbing, nickel free metal hardware, Velcro, polyester binding, velboa fabric.