Set of 3 steel penis rings, as elegant as they are secure. Simply slide a Trine ring over the penis and/or around the scrotum for a perfect fit. Enjoy the pleasure! Trine steel rings are compatible with most harness systems.: Set of 3 steel ringsMeasurements: Inner diameter: 3.8 cm; 4.7 cm; 5.2 cm Thickness: 0.76 cm