100 Ft Copper Mesh Many Uses Brewing Cleaning Pest Control Rodent Bird Exclusion" Made from 100% Electrilytic Tough Pitch (ETP) copper. Stuffit is an important part of rodent exclusion because it's made of the finest ingredients such as brass, copper and other inert metals. It is rustproof, stainproof and works great to seal weepholes and around plumbing, A/C, vents, and other places where rodents and insects enter. To be used for rodent and bird exclusion.