UltraLight Medium Rings Features ZEISS Ultralight 1913 Mil-Spec Rings are manufactured to the highest of standards from premium materials and with tight tolerances for your long-term safety and field applications. They are designed for optimal long-range shooting solutions and allow for either right- or left-handed operations as well as eye dominance. The bubble level is easily viewed from the shooting position creating no disturbance in your shooting position. A smarter sleeker and ultralight weight ring design for all heavy-duty hunting and shooting applications. UltraLight Medium Rings Specifications Integral bottom recoil lug for best alignment and a secure zero under the harshest recoil. Integral anti-cant bubble level in top half of ring. Approximately 4.41 oz. with screws (pair 30mm low). 7075-T6 aluminum Mil-Spec Type III 30-micron hard anodized finish - matte black Compact and refined design with low-profile non-snagging hardware Type 303 stainless steel top cap screws - with black oxide finish Micro-radiused on all machined leading edges to ensure a non-marring design