Strong plastic lids that are BPA free approved and are a lighter alternative to heavy metal lids and will not corrode over time. The cap features a textured top and ribbed sides. The ribbed-sided design allows for ease of use when removing lid. It also works well with liquid products. White Polypropylene Ribbed Lined PE Foam. Kitchentoolz Lids will suit your needs when it comes to brewing and fermenting wine, beer, kombucha, kefir, and all sorts of fun teas. The jar will keep its contents safe from the outside elements for long periods of time.