Go Ferment! Wide Mouth Mason Jar Glass Fermentation Weights & Recipe E-Book - Made in the USA (Pack of 4) MADE IN USA  All of our weights are Proudly Hand Made in the USA and Assembled by our small fermenting company in Boston, MA! SAFE MATERIALS  Our fermentation weights are made from the highest quality 100% soda-lime, lead-free, food safe glass in the USA! We use the same glass used to make mason jars. No more worrying about contaminates or other substances leaching into your ferment. Each weight has a beautiful polished look. DURABLE AND HEAVY  These are the heaviest weights available on the market! Each weight is 6.2 ounces with a diameter of 2.5 and a thickness of 0.75. These will keep your ferments completely submerged underneath your brine eliminating oxygen exposure. Their size allows for very easy placement in and out of your jar! COMPATIBLE  These will fit in ANY sized wide-mouth mason jar! These are a perfect complement to your mason jar fermenting kits or your traditional fermenting crocks! Our weights will even work in a Fido jar! FREE RECIPE E-BOOK  Not only will you receive 4 handmade glass weights in a beautiful gift box, we will also send you a Recipe E-Book with our favorite recipes to get you started with fermenting!