At first glance, some men confuse Magnum Rings with soft cock rings which don’t provide permanent enlargement. The Magnum Rings system slows blood from returning to the body rather than constricting blood in the penis.
Of all the studies I’ve read, penis extenders (aka traction devices) offer some hope for permanent penis enlargement. One major problem with extenders is they have to be worn eight hours a day for about six months. While the stress of traction may create the necessary micro-tears, these products focus on length gains and very little on girth.  In the end, gains are minimal and these devices cost hundreds of dollars.
Penis pumps may provide temporary enlargement but I’ve never heard anyone (except the manufacturer) make claims of permanent gains.
Magnum Rings provide an efficient, cost effective system for male enhancement and permanent enlargement.