These racks are molded in a single, continuous piece with no detachable pieces or assembly required. Full-size and half-size racks are made of Delrin® fiberglass-reinforced polyoxymethylene (POM), an advanced polymer developed to have exceptional chemical and heat resistance. Half-size racks are smaller and more convenient for incubators, fume hoods, refrigerators, and other tight spaces. Delrin racks are autoclavable. Light, flexible, and chemical-resistant polypropylene racks are also available. All racks feature trademarked teardrop-shaped slots for convenient storage and include molded-in index coordinates and flat areas for labeling.