The Support Sling Cock Vibe is an amazing and versatile stimulator. Whether you choose the wear the bullet under the boys, or on top, your shaft will be filled with a pulsating vibration that both you and your partner will enjoy. Take a dip in the spa or slip into the shower and surprise your lover, because this sling is waterproof! Stretchy enough to fit with ease, the Support Sling is also firm enough to keep your erection harder, longer! Batteries are included for immediate use. Measurements: Sling has 2.8 inch overall length, 1.9 inches wide, Bullet is 2.31 inches long, 0.75 inches in diameter Material: TPR, ABS Note: Requires 3 LR44 button cell batteries, included