From our CCM Graphics Extreme Restraints Online Bondage Store we feature the "Easy Access Restraint System" which is a comfortable, versatile and inexpensive spreader system. The cuffs are made of heavy duty nylon on the outside to hold the strongest prisoners, yet comfortable neoprene on the inside. The spreader mid-section is rigid so they can't adjust their position. The mid section is made of nylon with a reinforced bar underneath. The cuffs are secured using heavy duty Velcro. I have been using this spreader bar system for several years and I can tell you they are very effective. Outstanding for doggie style standing sex - either vaginal or anal, this restraint system puts your sub in a totally vulnerable position with her ass sticking up in the air and her cheeks spread apart. And for oral sex and behavior modification they also work nicely as shown below.