Light the Night! Try a glow in the dark Glo Nutz. Made from Pure body safe Elastomer. Glo Nutz is soft and ultra stretchy. Nutz is also incredibly strong so it will not easily snap. Glo Nutz. The preferred cockring of Real Men. Thickness of ring: .44″ / Inner Diameter: .78″ / Outer Diameter: 1.7″ Fishbowl Display of 40.