Glass Fermentation Weights for Fermenting in Wide Mouth Mason Jars


New and improved as of 12-12-16! Thicker, heavier, and with polished edges. The highest quality fermentation weights you can buy anywhere!

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.

Be sure to check out our silicone fermentation lids!

Buy a 6 pack and get them for only $4.99 each with free Priority Mail (1-3 day) shipping! (Any package over 1 pound is required to ship by Priority Mail)

Click on the “Single Weight” or “6 pack of weights” picture just below this text before clicking add to cart.

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Product Description

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, break, or chip.

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.

Additional Information


Single Weight, Six Pack of Weights

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    Questions and answers of the customers

    1. Answered by the admin Yes they are food safe, lead free, and non-porous. They are cut from sheets of tempered soda lime glass. The edges are cut glass that hasn't been polished. Thanks for your question, and feel free to direct any other inquiries to
    2. Answered by the admin Pint & half Mason jars are wide mouth, so these weights work perfectly with them. They actually work a little better with straight sided wide mouth jars than with jars that have shoulders.

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