Zerust Rust Prevention Plastabs .75" x .75" with Adhesive Backing Rust and Corrosion Protection for: Tackle boxes Pistol cases Ammo boxes Tool boxes Enclosure cabinets Control boxes Inhibits rust and corrosion for 2 years. Zerust Rust Prevention Plastabs with Adhesive Backing are thin, light, rigid polyethylene squares that are made with patented Zerust corrosion-inhibiting technology. Place Zerust Rust Prevention Plastabs in narrow or hard-to-reach areas to prevent rust. They're perfect for restricted spaces that contain compact electrical components, enclosure cabinets, control boxes, tackle boxes, tool boxes, ammo boxes and pistol cases. Zerust Rust Prevention Plastabs is the best way to protect your tackle and firearms against rust and corrosion. Just simply place it inside of the tackle box compartment or firearm case compartment and it will form a protective layer around the metal surfaces. They are hassle free and will protect your tackle or firearm for up to two years. .75" x .75" protects a radius of 0.4 ft (0.12m) for up to 2 years Pack of 20