These electro shock cups are flexible rubber and include the lead wire. They are perfect for use on the chest, as in the bra, thanks to the minimum distance between the electrodes. But still they can be used in different parts of the body, like the abdomen or the buttocks. They should go under a piece of tight clothing if you want them not to move from the site, since they are not self-adhesive. Use a contact gel to enjoy this product to the fullest. Features: Black Rubber