Simple And True Nubby Cockring – Single Use. This soft, silicone cockring is an ideal place to start for those new to the world of mutual, vibrating stimulation. It has a wireless, vibrating unit that not only excites and stimulates the penis shaft, but due to its nubby surface and design acts as a perfect clit stimulator. It can be used with or without a condom and is water resistant. The simple on/off switch means the pleasure is at your command.