Silver aluminum metal caps are rust resistant and offered with a PE liner. Here you will find a selection ranging in size from 20mm to 33mm to be paired with containers with matching neck finishes. The PE liner is a good general-purpose liner material, with a broad application base, and chemical resistance against acids, alkalis, solvents, alcohol, oil, household cosmetics, and aqueous products. These caps are offered at wholesale pricing in bulk for the best discounts.