The Zeus Electrosex Penis Bands are a very versatile toy. They are each unipolar, meaning electricity flows from one to the other. As they are adjustable this can lead to all kinds of arrangements. You can attach one to your balls and the other to the head of your cock, or just side by side on that perfect spot you want to stimulate. The elastic fit makes sure that they are just as snug as you would like them to be no matter where you place them. Placed at the base of the cock and balls a band can even be used as an effective and comfortable cock ring.Measurements: Adjustable up to 2.5 inches in diameter.Material: Elastic, Metal, PlasticColor: BlueNote: Comes with 2 bands with leads. Compatible with Zeus Power Boxes.