Most sprouting lids are either fragile plastic, or they rust. Our lid is made of heavy duty 304 stainless steel mesh, which will not break or rust. Also great for straining or sifting out of Mason jars! Regular Mouth includes one mesh lid insert and one stainless steel band / ring. Wide Mouth is a single piece with the band built in. Fits Ball, Kerr, or other threaded canning jars. The rounded design keeps your sprouts from touching the counter when you tip the jar upside down to drain it. Stainless steel is one of the most commonly used materials in the kitchen, used to make cookware, utensils, commercial food processing and storage equipment, and more. Stainless steel will not leach any chemicals into your food like plastic can. Dishwasher, boiling water, oven, and freezer safe