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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.

Select one of the variations by clicking a picture just below this text before clicking add to cart.

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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 can cause it to crack or break.

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 41 reviews
Liz Lindsey (Higginsville, MO, US)

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

Kathy Kapsner (Big Lake, MN, US)

Great, works as expected. Quick ship.

David Gilbertson (Duluth, MN, US)
Canning jar weights

They work great

Jodi Dominick (Carbondale, PA, US)
Fast ship and just what I'd hoped for

I'm very happy with my first order from Mason Jar Lifestyle. Fermenting weights are exactly what I was needing for mason jar fermenting.

Vickie McGowan (Cincinnati, OH, US)
Glass Fermentation Weights

Perfect for pickles. The weight of the glass works to keep the produce submerged.

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