Accordion bellows are convoluted, expandable, fabric or elastomer components used to protect screws, shafts, slide ways and other components from liquid, chips, dirt and other debris. These flexible, protective covers can withstand temperature extremes and are resistant to oils, chemicals, and sparks. Accordion bellows are round, square or rectangular in shape and can be manufactured with a variety of end configurations and options. Round and square accordion bellows can have either four closed sides, or three open sides and one closed side. In terms of materials, accordion bellows are made from laminated polyester, treated synthetic fabric, polyvinyl chloride (PVC), aluminized glass fiber, rubber, foil ply rubber, and rubberized fabric. Some accordion bellows are sewn and stitched round while others are comprised of molded materials. Important dimensions to consider when selecting accordion bellows include retracted length, extended length, inside diameter or width, and height.