High Quality Materials—Our food-safe glass is lead free and non-porous so it never absorbs food odors, flavors, or colors. Innovative Design—our smart bulge handle design makes it easy to take these weights out of your Mason Jars and offer a much more stable solution than other grooved weights. 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. 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. 100% Satisfaction - If you are not happy with your fermentation weights, we will give you a full refund!