Pumps have been in the marketplace for a while now (obviously not your local market). The idea is you place your penis inside the pump and then vacuum the penis to reach the size gains you want. Permanent changes take a while but can be ahieved.
   
"When the first airtight vacuum pump cylinder is placed around your penis, blood rushes into the muscle portion of your penis. The muscle tissue expands to the maximum, breaks down, and then rebuilds into larger and stronger muscles, similar to body-building which increases size."

The pumps available come in a variety of sizes and shapes, the best pumps to choose are the doctor recommended pumps. The pumps can be tailored to help with penis size problems and are used extensively in the medical field for penis enlargement and sexual dysfunction.