Plastic First Aid Unit Kit Boxes are available in HIPS (high impact polystyrene) to meet the expanding needs of the first aid market. All HIPS Kit Boxes have hinges with brass pins, positive nylon catches and cover gaskets. The 10, 16, 24, and 36 Unit Kit Boxes each come with a fold-down polypropylene combination handle/hanger. Identification as a 6, 10, 16, 24, or 36 Unit indicates the number of individually wrapped units they can hold. Removable plastic dividers are included in the 16, 24 and 36 unit models.