EASY GRIP HANDLE: The fermenting weights diameter is about 2.75 inch, fits perfectly with typical wide-mouth Mason Jars. SOLID & DURABLE: The net weight of each glass weight is about 7.4 oz, a lot heavier than others, nice weight for ferment, which works to hold the expanding ferment perfectly under the brine FOOD GRADE MATERIAL: They are made from food-grade glass CLEAR & SMOOTH GLASS: Smooth glass with no seams and the flat bottom to prevent air bubbles forming underneath. These canning weights make the perfect small-batch fermentation system 100% SATISFACTION - If you are not happy with your glass fermentation weights, we will give you a full refund. Great tool for fermenting & pickling, and a great addition to your fermenting hobby.