The look of Glass...The feel of Jelly The Macho Pulsating Erection Keeper is a super stretchy vibrating cockring that provides you with powerful, longer lasting orgasms. It features clitoral stim-u-nubs to enhance the experience for your partner, 7 vibrating functions, and a one touch on-off button. Batteries are included for immediate use. Measurements: 0.8 inch internal diameter (material stretches to fit), Material: SEBS, Color: Clear, Note: Waterproof, Phthalate Free, Requires 2 AG10 batteries, included