Smooth white polypropylene caps are offered here in sizes ranging from 70mm to 100mm. White polypropylene caps with PE liners are an effective way to keep a variety of different body lotions, skin creams, face washes, and cosmetics safe and secure. PE liners are three-ply and constructed of low-density foam cores between two solid layers of low-density polyethylene. The PE liner has excellent chemical resistance and a low moisture transmission rate. Plus, you can get them in bulk for a great deal.