High Quality Food Grade Materials - Our food-safe glass is lead free and non-porous so it never absorbs food odors, flavors, or colors. Set of 4 Pickle Pebbles Glass Fermentation Weights - 7cm Diameter, Now fits ALL wide-mouth mason jars Excellent Unversal Fit—Fits perfectly with typical wide-mouth Mason Jars, making them just right for small batches of fermented veggies and improving the entire lacto-fermentation process. 4pack pickling weights are great for fermenting vegetables and probiotic food,small batch sauerkraut, pickles or other fermented foods kit. Each Pickle Pebble is molded individually,Great for Sauerkraut, pickle, Kimchi, and any vegetable and fruit ferments,Better than ceramic weights. Bacteria cannot hind in non-porous solid glass Studry And Effective --Large and heavy enough to keep vegetables submerged below brine for best results of fermentation—better than DIY weights effective than DIY weights.