Our Sprouting Jar Lids are made of 100% stainless steel, durable, rust resistant and BPA free. Unlike breakable plastic, this metal will not melt or rust. The removable mesh keeps the sprouts off the counter and prevents mold growth while the jar ring holds it all together without rusting. These are good for all sizes of sprouts including alfalfa, mung beans, kale, cabbage, radish, broccoli, lentils, etc. They can also be used for spices, sifting flour or drinking loose-leaf tea. 4 per pack.