Optimize your experience with these silicone cock rings! The OptiMALE Thick C-Ring Set offers enhanced size and girth with three rings in 40mm. 45mm. and 50mm diameters. These rings are ultra-stretchable for easy use around the shaft or testicles. maintaining those long-lasting erections you`ve always dreamed of. and prolonging your ejaculation. Available in Black and Slate; phthalate-free silicone.