These are just rebranded fermenting lids. They're running 1.5-2x more expensive than the same exact product on Amazon.

Compare:

BurpLids: https://smile.amazon.com/Burp-Lids-LLC/dp/B07W7WF154/ref=sr_1_2?crid=2IAQ9B10FF9QK&keywords=burping+lids&qid=1660155970&sprefix=burping+lids%2Caps%2C63&sr=8-2 ~$40 USD

Fermenting Lids #1: https://smile.amazon.com/Fermentation-Brillenti-waterless-fermenting-automatically/dp/B07JMNMZN2/ref=sr_1_4?crid=2IAQ9B10FF9QK&keywords=burping+lids&qid=1660155970&sprefix=burping+lids%2Caps%2C63&sr=8-4 ~$26 USD

Fermenting Lids #2: https://smile.amazon.com/AMZUShome-Fermenting-Waterless-Fermentation-Sauerkraut/dp/B078RL7LBT/ref=sr_1_6?crid=2IAQ9B10FF9QK&keywords=burping+lids&qid=1660155970&sprefix=burping+lids%2Caps%2C63&sr=8-6 ~$19 USD

I have a set of the cheaper lids. They save my wrists when burping. Just pump the old air out, let new air in, shake the jar a bit, done.

That said, nothing wrong with regular old mason jar lids.