This over the door hanger is made out high quality durable smooth metal. The outer surface is made of a multi-layer anti-corrosion process, waterproof and rust-proof. SIZE: This Over the Door Hanger measures 18.1" L, 3.5" W, 11.8" H. MATERIALS: This over the door hanger is made out high quality durable smooth metal. The outer surface is made of a multi-layer anti-corrosion process, waterproof and rust-proof. Over the door hanger is easy to install, convenient and quick, no hole punching, no damage to the door panel, no staining of the paint. Door hook is suitable for doors up to 1 3/4 inches thick.