The Instant Pot® stainless steel inner cooking pot is food grade 304 (18/8), with no chemical coating, and 3-ply bottom for even heat distribution. The polished surface makes food stick less and easier to clean. Comes with inner markings at 1/2 and 2/3 for pressure-cooking safety. Having a secondary Instant Pot inner pot makes it convenient and easy when preparing multiple dishes with your Instant Pot cooker.