Stop the Rust and Corrosion that s attacking your firearms. Conventional gun cases only protect firearms from dust. In fact, if you’re a hunter you know that putting an unprotected gun inside a gun case means big trouble for your firearms. Conventional gun cases act more like a breeding ground to trap humidity inside the case … not keep it out. They actually accelerate rust and corrosion. The only gun sleeve that really stops rust and corrosion. Only Bull Frog Rust Blocker Gun Sleeves protect valuable firearms with the same vapor corrosion inhibitors (VpCls) developed for the military, NATO and major industries.