Purpose: Glass fermentation weights designed to keep vegetables fully submerged so your ferments stay fresh and avoid spoilage from excess oxygen. Compatibility and size: Fits widemouth jars with a 2.75' diameter opening. Compatible with Ball jars and other brands of widemouth canning jars. Material: Made from foodsafe soda lime glass—the same type used for jars—so there is no flavor or odor transfer and the weights will not stain. Safe, easy handling: Each weight includes a builtin handle to prevent slipping and make removal simple. If the handle is inaccessible or the weights are deep in the jar, they can be retrieved easily with a fork. Reliable performance: Keeps kimchi, sauerkraut, pickles and other fermented vegetables submerged beneath the brine to reduce the risk of mold and spoilage. Use scenarios Kimchi: Place the weights on of cabbage and seasonings in a 2.75' widemouth jar to hold ingredients under the brine during roomtemperature or refrigerated fermentation. Sauerkraut: Compress shredded cabbage, fit the glass weight to maintain full submersion and ensure an even, anaerobic ferment. Refrigerator pickles and smallbatch ferments: Use in Ball jars or compatible widemouth jars to keep cucumbers, carrots or other vegetables submerged for crisp, consistent results. What you'll notice No metallic taste or staining because the weights are glass. Easier retrieval thanks to the handle; fork retrieval works as a simple backup. Simple compatibility with common widemouth jar brands and sizes used for home fermentation.