Mojo Apeiros Vibrating Cock Ring from teh Electric Eel. This unique cock and ball ring focuses seven throbbing modes of vibration on you or your scrotum and perineum, more specifically. Looping over the shaft with the smaller of two rings and around back of the balls with the larger, the Aperios targets some of those often overlooked sensitive areas during sex. Of course, your partner will probably be feeling the vibe too, just not in a way they are used to. Waterproof vibrations.. Material Silicone. Requires 3 LR44 cell batteries, included.