Drying racks are for draining and drying labware. They may sit on the benchtop, be wall-mounted, or hang over a sink. Racks may include pegs or other adapters that keep the labware inverted while drying. Drying racks may be made from plastics (polystyrene, polypropylene), metal (wire), or hardwood. Some drying racks have heating elements or hot air features.