Are Revereware pots and pans made of aluminum or stainless steel?

I have been looking for an additional pot becasue I rec'd new REvere cookware for Christmas. I was tired of cleaning copper bottoms. According to the info on Rever's website, (non-copper bottom) the Tr-ply collection pots/pans are constructed of durable shiny stainless steel. The bottoms on the pans feature an encapsulated aluminum disk between 2 layers of stainless for quick even heat distribution. (From other sources, I have read that stainless by itself does not have even hest distibution.)