The Buoy is a soft, stretchy silicone ring, designed to keep the wearer harder for longer. Its thick and soft silicone keeps the testicles down and keeps the testes from contracting, thus slowing down ejaculation. This small-sized Buoy has an unstretched internal diameter of almost 18 mm for a tight fit.
Approximate Product Dimensions:
Width/Diameter: 1.75 in. (4.4 cm)
Unstretched Inner Diameter: 0.7 in. (18 mm)
Depth: 0.5 in. (12 mm)
After years of trying/using different C-Rings. The Buoy ring is by far the best I've found. It's flexible enough to attach even after your erection has started (difficult/impossible with a standard ring) yet it's firm enough to get the job done!