Continuous thread closure allows you to thread smoothly and seal tightly every time. This 24-410 white polypropylene (PP) plastic continuous thread closure has a ribbed skirt and smooth top. It includes a 0.035 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.