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.FeaturesCreates Thicker, Harder ErectionsClear Vacuum Cylinder with Centimeter Markings to Track ProgressSoft Silicone Sleeve for Airtight SealAir Release Button for Fast, Safe RemovalPressure Meter Gauge to Track ResultsPhthalate-Free, Body-SafeDimensionsTotal Length: 12 in. (30.5 cm)Insertable Length: 8 in. (20.3 cm)Unstretched Inner Diameter: 2.75 in. (70 mm)Circumference: 7.75 in. (19.7 cm)