The 4US Cockring from Rocks-Off is worn at the base of the penis so the vibrator is positioned vertically providing exquisite stimulation to the clitoral area while making love. The unusual profile of the ring accommodates even the thicker girth. The thicker arms of the ring transmit the vibration all the way to the tip of the penis. 4US is powered by our Rocks-Off award winning RO-80MM bullet (batteries included). 100% Waterproof. Black.