FREE US Shipping at $39. Smaller Orders $3.99 DETAILS
0 - $0.00
No products in the cart.

Free shipping on any US order over $39

Tempered Glass Fermentation Weights for Fermenting in Wide Mouth Mason Jars


These heavy, tempered glass weights perfectly fit into a wide mouth Mason jar to hold your fermenting vegetables under the brine and press out any air pockets, leaving a tiny space around the edges to let out fermentation gasses.

Glass weights that are not tempered often crack in half during fermentation.

We decided these weights chipped too easily at the sharp polished edge, so we are now hand sanding each weight before sending them out. This is extremely time consuming and expensive, but we didn’t want to risk glass chips ending up in your ferments!

The highest quality fermentation weights you can buy anywhere!

Fermentation weights cannot be shipped internationally – they are too heavy and expensive to ship.

We are currently out of sanded weights.

Guaranteed Secure Checkout

Free shipping on orders over $39

  • Outstanding customer service based in the U.S.
  • Colorado-based, family run small business
  • Satisfaction guaranteed

These weights were designed to be the very best on the market for fermenting in wide mouth Mason jars. They are 68.5mm (2.7 inches) in diameter and 18.5mm (.73 inches) thick. They weigh 6 ounces each (170 grams).

The weights are cut from sheets of high quality tempered soda-lime glass, the same material Mason jars themselves are made of. Most competing discs are not tempered, which is much cheaper to produce but less safe. Air bubbles and other imperfections in lower quality glass cause them to crack during use.

If you fill your jars up to the neck, one weight will perfectly cover your ferment. You can use more than one weight if the jar isn’t completely full or if you want to displace more brine to bring the level up to the neck of the jar. With more active ferments, you might not want to fill the jar into the neck to avoid overflowing brine. Then you will probably want to use two weights.

Glass does not leach anything into your food.

Dishwasher safe, boiling water safe, oven safe, microwave safe. Avoid sudden temperature changes.


Single Weight, Six Pack of Old Style Weights, Six Pack of Sanded Weights, Six Pack of Unsanded Weights


Mason Jar Lifestyle

Customer Reviews

Based on 45 reviews
Pam Wolfe

I would love to try this product and I’m waiting for you to re-supply. When might this happen?

Happy Fermenting (Indianapolis, IN, US)
Weights are nice

I bought these to weigh down my fermentations in Fido jars. The diameter is the perfect size; I can get my fingers in the jar to easily lift it out. They are nice and heavy. I do wish they were made in the US instead of China but the company states they do hand sand the edges. They are very nice and I would buy again.

james o. coles (Elba, AL, US)
Dood, that's heavy, man!!

I bought the fermenting lids & rings, and the weights. I love kimchi but it's a long drive from our home 'out in the boonies' to the nearest Oriental store so I started making kimchi at home about five years ago.
Most often my fermented foods were OK but not great -- because I wasn't keeping the leaves pressed down enough & fermentation was incomplete.
These glass weights fixed that issue right away! And the soft plastic valve tops kept the gas balance just right...both batches I've made since getting the items are at least 100% tastier than any I've made before.

Jenni Linck (Portland, OR, US)
Great weights!

I’m using them to weigh down my sauerkraut:-) they are awesome…

Liz Lindsey (Higginsville, MO, US)

This a second order and I have them working with the silicone fermentation airlock value lid - yum!

You may also like…

Tempered Glass Fermentation Weights for Fermenting in Wide Mouth Mason Jars