Realistically designed for use by men that seek a quality strap on penis. The Deluxe Vibro Erection Assist is gently curved and textured for added stimulation, and can be used with or without an erection. Durable and fully adjustable elastic straps are designed to fit most waist sizes. Take it up a notch by adding some vibration with the powerful built in variable speed bullet. This realistically detailed enhancement device has a six inch total length with an inside depth of four inches. Measurements: Dildo: 6 inches in length, 1.7 inches in diameter; Opening: 4 inches deep, 1.3 inches in diameter. Material: Silicone, elastic, metal. Color: Black. Note: Requires (2) AA batteries, not included