The biggest advantage is simple and convenient to use a variety of ways， using sucker suck， still above the hook， you can hook to be mutual aspiration to become handcuffs， leg irons， so do not matched with the chain， it does not Also buy arms and legs， can suck the desk， on the wall， on the floor， mirrors， anywhere Cheng Huan， small size， easy to carry， no longer have to look at a lot of rope headache it!