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.