This is an oldest penis enlargement device which was actually introduced to treat peyronie’s disease (it is a condition where the penis is curved irregularly). But later it was found to be useful for enlargement of penis and then people began using it for penis enlargement. This is the oldest among all the modern penile enlargement devices. It has got the name Jes-Extender from Jes Bech Mueller who is the CEO and founder of DanaMedic Aps, where this device was developed.