Simple in form. yet intended to be worn with purpose. These steel cock rings are as elegant as they are strict. There is no give here! Simply slip a Trine over the penis like a halo. encircling the scrotum for a supremely snug fit. Revel in the pleasure! The Trine Steel Rings can also be used to fit most harness systems. Size Small Inner Diameter: 1.53 Medium Inner Diameter: 1.82 Large Inner Diameter: 2.05 Thickness: .3