an effective stimulation and a really stylish design. The vibrations also adds the advantage of not needing to move back and forth. Still owning quite a diverse collection of devices from other manufacturers, I can say categorically that Sinvention makes a superior product. The time they spent with me to insure they understood my requirement was well worth the investment; the quality of the Sinvention bondage belt actually exceeded my expectations. Cobra Libre has won a design award, where it was named the most innovative sex toy for men. You control the stimulation of your penis head. Sinvention custom leather bondage is superb!