The Ultra Duracook 8-liter stainless steel pressure cooker is made of food-grade stainless steel that resists rust. A three-layer composite foundation with high-impact bonding helps food cook more quickly and without burning or sticking.handles made of robust, heat-resistant solid bakelite with twin screws for longer life.Due to the AISI 304 food grade stainless steel used in the construction of the 8-liter Ultra DuraCook pressure cooker, rust-free, wholesome food is Warrantyd. The high-impact bonded three-layer composite base facilitates homogeneous cooking without scorching or charring by enabling even heat distribution through the bottom. Additionally, cooking takes much less time than in other conventional cookers. Upgrade to an Ultra Duracook stainless steel pressure cooker for the benefits of fast and healthy cooking as well as durability.