Precision CNC machined from 7075/T6 aluminum for a high strength & lightweight platform Mil-Spec hardcoat anodized finish for abrasion and corrosion resistance Rings feature stainless steel hardware for Element Proof protection 40mm scope rings for large 40mm tubed scopes. Warne 40mm Mountain Tech Rings are lightweight and element-proof. We engineered Warne Mountain Tech as a lightweight and rugged scope ring design that is equally at home on a mountain or precision target rifle*featuring 7075 aluminum construction and stainless hardware to withstand the punishing conditions Mother Nature can dish out.