When you're looking for the ultimate beginner's cock ring kit, the Silicone 3-Ring Stamina Set is the proven choice for rock-hard erections that last and last! With three super-stretchy silicone rings to choose from, this trio is the perfect assortment to help you achieve your maximum potential! The ring's tight squeeze will put a clamp on performance letdowns and make a stud out of any man! Try the rings in different combinations to find the most explosive results! Use all three rings at the same time for the ultimate stamina test. Material: Silicone Small Cock Ring Diameter: 1.25" (3.1 cm) Medium Cock Ring Diameter: 1.6" (4 cm) Large Cock Ring Diameter: 2" (5 cm).