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Not the best erection ring I have owned, but definitely not the worst. I cut mine too short and had to throw it away. Stretchy, but not very, so make sure to measure correctly. Should fit all men. If you happen to be smaller than average, then the connections in the tubing will create a flat spot in the ring and may not keep you hard or even be uncomfortable.
The Double Helix cock ring combination may be simple in design and function, but it's a good choice for beginners because the rings can be custom cut to fit. Also, it looks good when worn.
This a great toy if you can get the measurement right. I liked the look of it, and the black rubber gives a rugged look and feel, but it grabs pubic hair too easily. I am giving this toy 4 stars, but it would be 5 if it was not so hard to get on and off without pulling hair or pinching skin. Skin and hair around the boys are definitely where you do not want it pulled or pinched.
If you take care in cleaning your toys and don't plan on using lube, give it a try. It'll be worth it.
All in all a great toy to get used to cock and ball combos. A good choice if sizing and experience are still unknown.