The smooth silver polypropylene plastic caps are available in a wide range of useful sizes here from 53 mm to 89mm. The silver plastic caps feature a three-ply PE liner, which is composed of a low-density foam core between two solid layers of low-density polyethylene. The PE liner has excellent chemical resistance and a low moisture transmission rate so that it could work well with many body lotions, skin creams, face washes, and cosmetics. Try using these silver plastic caps as a cost-effective alternative to silver aluminum caps. These caps are available in bulk at wholesale pricing for the greatest discounts.