There are three basic types of clothes hangers. The first is the wire hanger, which has a simple loop of wire, most often steel in a flattened triangle shape that continues into a hook at the top. The second is the wooden hanger, which consists of a flat piece of wood cut into a boomerang-like shape with the edges sanded down to prevent damage to the clothing, and a hook, usually of metal, protruding from the point. Some wooden hangers have a rounded bar from tip to tip, forming a flattened triangle. This bar is designed to hang the trousers belonging to the jacket. The third kind  is plastic coat hangers, which mostly mimic the shape of either a wire or wooden hanger.