Over time metal canning jar lids get rusty and no longer provide a tight seal for storage. We find these Ball brand storage caps have more ways than just storing preserved food. Try dry pasta, brown sugar, rice, herbs, spices, meals-in-a-jar, freezer jams, beads, buttons, screws and nails, loose change and more! The versatile plastic lids are BPA free and dishwasher safe (top rack) and be reused over a period of several years. Package of 8.