Inspired by the legendary M61 Vulcan Gatling-style rotary cannon. The M61 and its derivatives have been the principal cannon armament of United States military aircraft for sixty years. External surface, internal rifling and all dimensions of the ring are similar to the M61 gun barrel. Bold and rebellious, it will become the best friend and mascot for you. Personalized engraving on the ring as the pilot’s name on an aircraft. Dimensions: 10 mm band width, 2.5 mm band thickness approx. Material: 925 solid sterling silver oxidized.