Kink Lab Rubber Cock Rings 3 Pack. These rubber cock rings have a seamless construction, completely rounded edge, and give the user a choice of three different diameters to ensure comfort. Great for experimenting with cock ring play, this pack allows the user to discover just the right fit without having to buy several rings and discover their size by trial and error. This cock ring set is also ideal for using with women’s harnesses that have an interchangeable O ring option. Also available in a steel version, these fun and simple sex toys offer firmer, stronger erections. Color: Black. Type: Cock Ring Set. Material: Rubber. Diameter: 1.5 inches, 1.75 inches, 2 inches.