WPO35 Steel Blackline® – Peacock Hoops This great hoops are sell by pair. You can wear them in your lobes and tunnel too! The pin of the hoop is 1.0 mm. Diameter: 60.0 mm. The entire length of the hoop is 117.0 mm. They are made of high quality stainless steel. You should take them out before showering and go swimming because they could lose the color.