I have gained over an inch in length (2.5cm) and half an inch (1cm) in girth using the penis extender.

A penis extender is an external medical device with tentative evidence as of 2019 for Peyronie's disease and increase penile length. It acts as a mechanical, traction device that stretches the human penis in the flaccid state to make it longer.

Penis extenders usually have a plastic ring that sits at the base of a flaccid penis, and another ring before the glans penis, with a traction device that runs along the sides of the organ. The wearer adjusts springs, which pull the penile shaft with the intention of stretching the flaccid penis to become longer.