Oh they work MIKE3209....the official Power Jelq Device rollers are way better than any other Jelq Device that I have seen besides the Jelq Gym. I can do plenty of intense jelqs with it and it makes jelq alot easier since my penis can get to almost 8 inches with great expansion. There is a learning curve to using it but it's easy to learn in the first session. I just need to find out how to purchase a new set of DURA-rollers for mine.