Plastabs with Zerust Rust Prevention and Protection are small polyethylene squares that are made with Zerust corrosion inhibiting technology. Plastabs with Zerust Rust and Corrosion Protection are great for protecting tackle boxes, tool boxes, and other medium size storage containers from rust and corrosion. Also great to use for those areas that are narrow or hard-to-reach. They are also non-toxic and odorless. Use Zerust Rust Prevention Plastabs for an easy rust protection. When storing your tools or other metal stuff, put the Zerust Corrosion Inhibiting Plastabs in the case and it will form a protective layer around the metal surfaces. Will last for two years! 1" x 3" protects a radius of 0.6 ft. Pack of 10.