Most penis pumps consist of a clear plastic tube into which the penis is inserted. With a pump a vacuum is created, drawing blood into the penis. A constriction band is placed at the base of the penis, keeping the blood trapped inside so it will stay erect. The band should not be left in place for more than half an hour.
It’s used by guys who have difficulty getting an erection. Many guys like this solution because it is non-invasive. The main disadvantage is that ejaculation may be painful because of the tension ring.
Sometimes tiny blood vessels may rupture, resulting in red or blue areas on the penis. These fade away after time.
Penis pumps are sold on internet with the promise of penis enlargement. They are supposed to work miracles. But the result will be disappointing. There is no proof whatsoever that these pumps will increase the length of the penis one inch, even if it is used every day. So don’t be fooled by the promises made.