Your A10 Piston can provide a near endless variety of pleasure. And you can get even more out of it by changing the size of the inner cup. This is a spare medium-large size inner tube for the robotic masturbator that works with the Rends R-1 Base Unit. Use it to provide a wider-feeling sensation or as a total replacement because you have used your first cup so much you need a new one!
The A10 Piston Cup (Medium-Large) for R-1 Base Unit features: