Nightforce Ultralite rings are CNC-machined from 7075-T6 Aluminum and feature a titanium crossbolt and jaws, delivering a set of rings that is 50% lighter than steel yet more durable and reliable. Serious shooters choose Nightforce accessories to ensure their success at the range, as they know that the most state-of-the-art equipment and precision craftsmanship are necessary for peak performance. NightforFinishMatte BlackMaterialAluminumHeightMediumStylePicatinnyExtendedNoTube Diameter34mmHeight (Base to Bottom of Tube)0.334 InchesCountry of OriginUnited States of Americace has become the standard for such excellence.