With the Unity Harness System, you can give your partner the ultimate double penetration experience. The dual ring design allows you to use your imagination as to what accessories to use . The straps snap onto the double ring to hold it in place. Comes with two sets of O-rings, metal for weight and rigidity, or silicone for a little bit of stretch and give. The comfortable and fully adjustable nylon harness easily fits up to a 152.4 cm waist circumference. Use one or both rings, either as a strap on harness or as a double penetration cock ring harness for men. Measurements: Cock rings: 4.4 cm and 5.1 cm cock rings, straps measure 1.9 cm wide.  Material: Nylon, silicone, metal. Note: Comes with harness, 2 silicone rings, and 2 metal rings, dildos sold separately