Made completely from real carbon fiber, the same material used in aerospace, race cars and more. The ring has a matte finish and measures 6 mm wide. Each ring comes in our signature acrylic box with magnetic top closure. More about our Comfort Fit: Each Oliver Paul ring is designed in our comfort fit style. Comfort fit rings are designed to slip on and off fingers and over knuckles more easily than a traditional fit thanks to a unique domed interior.