This process is often done by automated equipment, but manual and semi-automatic shrink wrap machines are also available. Shrink wrap machines cover the item, and then sent it through a heat tunnel or oven for shrinking. They are used to wrap many different types of packaging, including aerosol containers, bags or pouches, blister packs, bottles or jars, cans, capsules, cartridges, cases, cups or trays, drums or kegs, pallets, tubes, vials, and other packaging containers. Specialized and proprietary shrink wrap machines are also available for a variety of applications and industries.