Flukers Screen Covers are made of durable metal to provide a secure habitat for your reptile or amphibian. Its durable construction withstands high temperatures and heating devices while allowing excellent air circulation and reducing growth of mold and bacteria. Durable metal construction withstands high temperatures from heating devices Mesh screen allows air circulation to minimize growth of mold and bacteria Helps provide a more secure and stable environment for reptiles Flukers Screen Covers are sized to fit most standard terrariums.