External side of the ring is made in the form of a classic ring with brush marks. Internal side is made in the form of a groove gun barrel rifling based on Brunswick rifle with muzzle-loading. The Brunswick rifle used a special round ball with raised ribs that fit into two spiraling grooves in the barrel. Grooved design, tough inside, it will become a secret weapon in your hands. Dimensions: 5.5 mm band width, 1.5 mm band thickness approx. Material: 925 solid sterling silver oxidized.