Please refer to QRP Basic Fermentation Instructions when using our PATENTED OCCUPARE VITA FOOD FERMENTATION WEIGHT CUP, which situates on the mouth of any brand standard Mason Jar. While other systems advise us not to fill the jar more than ¾ full, our kits get a FULL jar food fermentation. Our Cups also have numerous other benefits over GLASS OR CERAMIC FERMENTATION WEIGHTS. The Fermentation Weight Cup 2) stays put in place and can't shift, 3) holds the fermenting food submerged in the brine, 4) leaves very little air space in the jar, 5) Deters mold, 6) Prevents messy overflow, 7) Protects any airlock device from becoming contaminated by the food and juices, and is 8) Easier to remove than glass weights. And who wants to take the risk of glass or ceramic chipping or breaking into the food?! Glass or ceramic fermentation weights are known to burst for no apparent reason during the fermentation process causing waste of the entire batch. Copyright 2019 Quality Reliable Products, All Rights Reserved.