Palm-Tec Overdrive Vibro SleeveStroke into overdrive. Ergonomically designed to fit in the palm just right and contoured inside and out for a powerful finish. The textured interior is tight enough for friction and contains ultra satisfying inner texture for enhanced sensations. For your stroking pleasure the Overdrive is made of clear, ultra stretchy TPR, so it conforms to your rod and comes equipped with an optional vibrating bullet so you can add some vibration to your stroke.