This set of three ultra stretchy and extra strong cock rings will have your rod super hard and ready for anything! The thick, firm material helps retain blood flow, for stronger, longer lasting erections. Use one or all three for enhanced hard ons! The durable material stretches to fit nearly any size, for quick, easy, and lasting results! Measurements: 0.75 inch in diameter unstretched. Material Thermoplastic Rubber TPR. Colors Red, blue, and black.