Zerust Rust Prevention Plastabs 1" x 3" - Pack of 10 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 3" protects a radius of 0.6 ft (0.16m) Pack of 10