For those new to cock rings; this black vibrating stimulator is power packed with pleasurable features. The ring itself is a soft silicone material that will stretch & flex. Once you slip it over your erect penis it will sit snugly at the base of your shaft. The ring restricts blood flow & this enlarges your penis & means that you can maintain an erection for a longer period of time. With one touch of a button both you & your partner will feel the vibrations. Because it is so powerful; suggested use is only 30 minutes at a time.