Triply cookware is made with three bonded layers stainless steel on the inside, an aluminum core in the middle, and stainless steel on the outside. The aluminum layer spreads heat evenly, while stainless steel ensures durability, safety, and compatibility with gas and induction cooking, making it ideal for everyday use. https://www.omichef.com/collections/stainless-steel-cookware/products/trio-sandwich-bottom-stainless-steel-pressure-cooker-inner-lid-induction-gas-compatible