This is a comfortable and inexpensive spreader system. The cuffs are made of heavy duty nylon on the outside, with comfortable neoprene on the inside. The spreader midsection is rigid (nylon with a reinforced bar underneath) so the wearer cannot adjust their position. Integrated cuffs secure using heavy duty Velcro. The ankles are 16 inches apart and the wrists are 9 inches apart. Lighter than a metal spreader bar.