The Trinity Silicone Cock Rings include three sizes of durable yet stretchy rings. Simply choose the size that is most comfortable for you and slip the ring over the shaft, or shaft and testicles, to enjoy a larger, harder, longer-lasting erection. Use two at once for even more intensity Made from premium silicone, these rings are safe on skin, non-porous, and easy to clean. Measurements: Inside diameters of approx. 1.25 inch, 1.50 inch and 2 inch Material: Silicone Color: Black