Weck Keep-Fresh Lids
Food expands when frozen, so these lids will expand to prevent pressure building inside Weck glass jars. Made from BPA-free plastic, these lids provide a strong seal and will not react with foods or absorb odors. Recommended particularly for refrigerator and freezer storage. Microwavable and dishwasher safe. Weck developed and introduced home-canning methods for glass jars over 100 years ago, and still manufacture out of their original factory in Oflingen, Germany. Small Covers measure 2.75" diameter, Medium Covers measure 3.5" diameter, and Large Covers measure 4 3/8" diameter.