Sauer Stones - Large Glass Fermentation Weights for Mason Jar Fermentation, Preservation and Pickling - Fits ANY WIDE MOUTH MASON JAR - 4 Pack 4 Weights and Secure Gift Box Included Approximately 2.75" in Diameter x 0.75" in Thickness - slightly curved bottom allows air and gas bubbles to escape Made from High Quality Lead-Free Pure Soda Lime Glass and Tested by SGS North America Fits ANY Wide Mouth Mason Jar Perfect for Sauerkraut, Real Pickles, Kimchi and any other Vegetable or Fruit Ferments Fill your Mason jar with vegetables and brineleave about 1.75 of room for your Sauer Stone! Fit a Sauer Stone into the mouth of the Mason jar so its slightly submerged and weighting down the vegetables. Scoop out any food that has floated above the Sauer Stone, and enjoy the magic of fermentation! Sauer Stones weight fermenting food below the brine to prevent oxygen exposurethats what can cause mold. Sauer Stones eliminate the risk of spoilage to save time and money. Sauer Stones deliver delicious results and are made of food-safe glass. designed to the highest standard of function and durability; tested and certified to be food-safe; and inspected before shipping to ensure it will exceed your expectations.