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This acrylic electro cock ring is designed to go around the cock and balls, just like a regular cock ring. Not only will it help maintain a strong erection but each ring has two metallic conducting strips that will create an intense sensation when equipped with an electro power unit. Compatible with the Folsom and Eros Tek banana leads. Comes in 2 sizes: ?Medium has a 1.75 inch diameter opening. ?Large has a 2 inch opening. The large fits 80% of men. For the Zeus Poer box you will need need the Pin to Banana Inline Adapters.