Male Penes Pump Manual Vacuum Penis Enlarger Sex Toys For Man Penis Enlargement Penile Extender Trainer Adults Sex Products 30cm 1. Made of high-quality and thick transparent acrylic material, this product provides two unit scales (centimeters and inches) for observing changes in the penis. 2. We offer eight sizes of cylinders (based on inner diameter, with an error range of 1-2mm). Dropshipping is supported, please contact customer service for a price quote. 3. This high-performance pump ensures a good sealing effect and is compatible with various cylinders and tubes. It includes a training vacuum kit and expansion kit. 4. Designed with a professional flange wide-body pump, it is suitable for modifying accessories of the LeXLuv performance trainer as well as many other brands. Choosing your size:  To make sure you will get the right size of the pump for you, measure by wrapping string or dressmakers tape around the base of the shaft of your penis when erect. Divide that length by 3.142 and the result will be the diameter of your cylinder. If you choose the next nearest diameter larger it allows for expansion. Note: 1.Acrylic cylinder prohibit the use of alcohol cleaning. 2.Please clean the product when using, and dry it spontaneously after use. Do not use high temperature hair dryer to dry it. 3.The product can be used with lubricating fluid, In order to exercise the penis more comfortably, it is recommended not to use the sealing ring, because the sealing ring will bind the penis body and cause poor blood circulation. When using the product, the hair on the penis can be shaved to achieve the best sealing effect.