Prepare yourself for larger, thicker erections with Rock Solid's Boost It Penis Pump. This pump's clear vacuum cylinder allows you to track your growth with each pull of the lever. Its silicone entry sleeve keeps the pressure in, and its easy-release button gives you the ability to move on to your next endeavor. Pressure Meter Gauge to Track Results | Comes with Easy Pull Handle and Soft Silicone Sleeve for Airtight Seal. Approximate Cylinder Dimensions; Total Length: 11.75 in. (29.8 cm), Insertable Length: 8 in. (20.3 cm), Unstretched Inner Diameter: 2.75 in. (70 mm), Circumference: 7.75 in. (19.7 cm). Rock Solid products are designed by a team of cock ring specialists to fit comfortably, be durable and restrict blood flow resulting in a firmer erection. Rock Solid offers top quality products in a variety of modern materials and proven best-selling colors as well as cosmetics to enhance your experience. For Adults Only.