Bull Frog Rust Blocker Emitter CupRust Blocker Strips - Stops rust and corrosion in enclosed spaces. Hang it in a gun safe, storage locker, trunk or closet. Hang it up in a second and relax for a year. One emitter strip protects a 1 cubic foot space, a cup will protect 11 cubic foot, and a shield can protect as much as 2.8 cubic meters.
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