Impress your partner with your longer, harder erection - and then thrill her with vibrations to drive her clit crazy! This 3-piece set of Sinclair Institute Select Oh Rings includes a removable bullet for a truly orgasmic experience that you'll both love! The set features 3 uniquely shaped cock rings with a removable 3-speed bullet vibrator that can be used independently. It is made of clear skin-like material and uses 2 AG5 watch batteries (included). Small: 2.43" High x 1.43" Wide x .68" Deep. Medium: 2.67" High x 1.96" Wide x .68" Deep. Large: 2.22" High x 2.22" Wide x .68" Deep.