The Pack NOCO Oil-Based Anti-Corrosion Battery Terminal Protector Washers are designed to protect your battery terminals from corrosion. They are made with an oil-based formula that helps prevent rust and corrosion, extending the life of your battery. These washers are easy to install and provide a reliable barrier against moisture and other corrosive elements. They're a great addition to your battery maintenance routine. Let me know if you have any other questions.