i bought these lids for making pickles in wide mouth mason jars, and the first batch was a success! the lids are very solid and by no means feel cheap. Unfortunately however, by the time they were ready two of the lids stopped remaining sealed and i had to re-seal them after about 12 hours. after a few more uses none of the lids would hold a seal. i was only pumping them 2-3 times as the instructions said but no luck. oh, and then the pump broke too! I gave 2 stars because i was able to use the seals off of other reusable lids i had, was able to make a new pump out of a hand vacuum, and the shipping was quick. Now all the lids work fine and over all i'm not too upset about it