Air-Seal Jars deliver freshness and good looks in one package. Their zinc-plated metal snap closures provide a strong secure seal and an added touch of charm. Jars are square with rounded corners. Blue lids offer a stylish touch to an already attractive package. Made in Italy by Bormioli Rocco and feature superior clarity and finish. Jars do not provide a liquid-tight seal and are not capable of withstanding high temperatures during food preservation.