Flambeau's Zerust Plaque are perfect for tackle boxes, pistol cases, gun cases, truck boxes, ammo boxes, tool boxes and more. The capsule provides up to 5 years of anti-corrosion protection. Zerust has proven to be the absolute best way to protect your tackle against rust and corrosion. Molded right into plastic, this patented polymer emits a harmless vapor, forming a protective layer around metal surfaces. All Zerust products will maintain their effectiveness from two to five years or more, so you can count on hassle free, long lasting protection.Features Protects your gear against rust and corrosion Emits harmless vapor, protecting metal surfacesMaintain effectiveness from 2 to 5 years or more