Plates and bowls are made of Silica, the most prevalent mineral in the world;Lighter plate makes handling the plates easier;A lighter plate makes handling the plates easier;For use with wide-mouth standard size mason-type jars and lids;Re-vacuums jars easily;Great for liquids, sauces, fragile foods and dry goods;Air-tight and odor proof;Dishwasher safe and BPA free;Tube Hose not included