Zerust Rust Prevention Plastabs 1" x 1" - Pack of 20 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 1" x 1" protects a radius of 0.5 ft (0.15m) Pack of 20