Zerust Rust Prevention Plastabs .50" x .50" - Pack of 25 Inhibits rust and corrosion for 2 years. The best way to protect your tackle and firearms against rust and corrosion Plastabs are thin, light, rigid polyethylene squares that are made with patented Zerust corrosion-inhibiting technology .50" x .50" protects a radius of 0.3 ft (0.09m) Pack of 25