When one just won't do, there's the Super Silicone Cock Rings. A set of cock rings in 3 different sizes, these rings make it simple to have longer, harder, and stronger erections. Made of 100% silicone, these rings are waterproof and phthalate-free. Each one in this set has a unique diameter (largest: 2", medium: 1.625", smallest: 1.25").