Master Series Trine Steel Cock Ring Set 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. Measurements cock ring inner diameters: small ring 1.53 inches, medium ring 1.82 inches, large ring 2.05 inches. All rings are 0.3 inch thick. Material Steel.