Prepare yourself for bigger, thicker erections with Rock Solid's Beginner Penis Pump. This clear pump allows you to see your growth with each pull of the lever. A quick-release button lets you adjust pressure and get out fast when you're ready to progress to the rest of your play.Features Creates Thicker, Harder Erections Clear Vacuum Cylinder with Centimeter Markings to Track Progress Soft Silicone Sleeve for Airtight Seal Easy Pull Handle Air Release Button for Fast, Safe Removal Phthalate-Free, Body-Safe Dimensions Total Length: 8.75 in. (22.2 cm) Insertable Length: 8 in. (20.3 cm) Unstretched Inner Diameter: 2.75 in. (70 mm) Circumference: 7.75 in. (19.7 cm)