Dual-Density CyberSkin(R) Tip is firm on the inside, supple on the outside. Removable vibrating bullet. Extends penis and enlarges entire girth Smooth surface becomes slick when lubricated. Designed to wear during intercourse. Can be trimmed to a customized fit. Super stretchy to accommodate most men. Firm tip for easy penetration Phthalate & latex free Requires two AG13 batteries (included) Materials: TPR.