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The 70G-450 White Ribbed Polypropylene (PP) Caps are designed for impact strength and features ribbing so they are easy to open with slippery fingers. This cap comes with a F-217 Sureseal foam liner. A foam liner has a thin low density foam ring, which is sandwiched between two layers of low density polyethylene (LDPE) film designed for chemical resistance or low moisture transmission. These liners also protect from odor transmission and do not impact the taste of food products in the container. Made in USA!! Get rid of the rust and metallic taste of your old metal lids forever with J&S Plastic Regular Mouth Mason Jar Lids!! Get yours today!!