Definition
An ED ring, in one paragraph
An ED ring, or penile tension ring, sits at the base of the penis. An erection happens when blood flows in and is held there; the ring’s gentle, even pressure slows blood from leaving, which helps an erection stay firmer for longer. FirmTech rings add a second loop behind the testicles so that pressure is spread across the base.
FirmTech states its rings keep blood in without blocking ejaculation.