Colanders & Strainers features:Copper mesh is a unique exclusion material that prevents pesky rodents from entering your home or office building. Specially, copper tastes bad to them so it is an effective block if tightly placed. This knitting mesh will help a lot. FeaturesColor:CopperMaterial:Copper WireSize: About100.00X10.00X0.10cm/39.30X3.93X0.04inch.-Because of the way the mesh is woven, it is very difficult for rodents to chew through itUnlike stainless steel mesh, copper tastes bad to them so it is an effective block if tightly placedCopper mesh is a unique exclusion material that prevents pesky rodents from entering your home or office buildingThe Copper Knitting Mesh is a copper mesh wool material that is rust-proof and stain-proof. Stuff it into openings around pipes or other holes and cracks in the structure and keep rats, mice, birds and other wildlife outEasy Install. Use caulk to help hold the mesh in place, lay out a thin line of caulk on either side of the hole or area you want to cover with the mesh, then press the of the mesh into the caulk and you've sealed your opening.