11 layer fully multi-coated optics for excellent clarity. Fixed parallax distance of 100 yards. 30mm mono-tube chassis for superior strength. Glass etched reticle with red and green illumination with 5 levels of brightness. 1/4 MOA exposed and locking turrets. Fast focus eyebell and high torque zoom ring._x0001__x0000__x0000__x0000__x0000__x0000__x0000_Nitrogen purged water, shock and fog proof.