A c-ring holds the testicles down and keeps the testes from contracting thus slowing down ejaculation.
The constriction takes orgasm from about 6 seconds to up to 45 seconds.
The Soft Ringis stretchier than the standard Tantus C-rings, so it is easier to put on.
Great for beginners, too.
Last but certainly not least: you don't have to put it on before an erection occurs the silicone is stretchy enough you can put it on anytime.