The Miracle Massager fit into it. For the price of it I think that the quality could be a lot better. This can be used with many of the massager-style vibes on the market. Keep pulling and then push the handle down inside. I think it would be a fun experiment to get a VibeRider for my girlfriend and see if a pulsating passenger seat whose intensity is synced with the RPMs of the engine can still, uh, hit the spot in the same way all the hi-tech and app-driven personal pleasure devices we have today do.