Tramontina Prima Stainless Steel Steamer Insert Fits 3 4 quart pans. Premium heavy gauge 1810 stainless steel 18% chromium, 10% nickel for strength and stain resistance. Tri ply bottom construction 1810 stainless steel pure aluminum magnetic stainless steel, heats quickly and evenly. Even heat distribution with no hot spots or scorching. Precision fitted lids reinforced pot rims for self basting performance that locks in nutrients. Ergonomically designed stainless steel handles knobs. Induction ready. Lifetime warranty, satisfaction guaranteed.