Crimson Trace 0101550 Brushline Black Anodized 3-9x40mm 1" Tube BDC Reticle The Crimson Brushline optics are designed with the hunter in mind and have been built from the ground up. The line features lightweight aluminum grade 1" tubes. They are green multi-coated, capped turrets, corrosion resistant, nitrogen purged, waterproof and ready for whatever elements they encounter.