These white polypropylene airless pumps feature silver collars made from an aluminum shell and paired with clear AS (acrylonitrile styrene) airless pump bottles, and on top are clear AS plastic caps that help to prevent unwanted discharge of the airless pump bottles while storing and transporting. The airless pump bottles feature small air intake holes in the base, creating a vacuum and pushing the inner plate upward to dispense product without air contact. Reducing your product\''s contact with air can help its shelf life. Choose these airless pump bottles to house products such as cosmetics, face creams, hair serums, and much more.