Stainless-steel construction using a special tri-clad base for quick, uniform heating. Ideal for use on normal and smooth leading ranges. We advocate the Instant Pot Rio 6-quart to many people. It’s an up to date version on the Instant Pot Duo 6-quart (our top decide on from 2016 to https://pressurecookers.us/articles/harnessing-efficiency-with-a-pressure-cooker