My girlfriend and I were looking for ways to be able to have the intensity we desire during our intimacy without the pain. This is my thoughts on the product. Fantastic material that is super comfortable, and the rings work perfectly not separating or changing position on the shaft although lubed up, almost like a thick penis ring. The only constructive criticism I would give for some R&D is that it would be nice (from the male side of thought) to have some sort of texture on the inner side of the rings, nothing too harsh but some subtle bumps, a bit like the dimples on the outer layer of the rings to have some more sensation on the shaft during intimacy. Otherwise great work on a great product. It's really a relief not having to worry if I am hurting someone I care deeply for (pun intended).