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 ultralightweight ring design for all heavy-duty hunting and shooting applications.