Continuous thread closure allows you to thread smoothly and seal tightly every time.This 24-414 black polypropylene (PP) plastic continuous thread closure has a ribbed skirt. It includes a F217 foam liner innerseal. These closure types are widely used across Cosmetics and hair products, Craft paints, Adhesives, Food and Pharmaceutical. Note: F217 liner is taste and odor resistant, and has a low moisture transmission rate, meaning it prevents moisture from entering the bottle and affecting product.