Alpha Scope Ring 30mm Steel High Sig Hunting Complete Set Black by Sig Sauer Sig Sauer's proprietary steel alloy Alpha Hunting Rings are machined with an exactness that is both strong yet ductile that allows our rings to form around a riflescope and yet will not damage scope under proper installation. The steel rings are epoxy powder coated to prevent oxidation and resist gun oils and cleaning solutions and and outdoor exposure. Features: Steel Weaver-style rings