The Genuine Instant Pot inner cooking pot is stainless steel food grade 304 (18/8), with no chemical coating, and a 3-ply bottom for even heat distribution. The polished surface makes food stick less and is easier to clean. Designed with inner markings at half 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. Not compatible with Instant Pot Duo Evo Plus series.