http://www.discoverwaterlesscooking.com Our Vapo-Seal cookware is a surgical stainless steel cookware set consisting of 17 pieces. Each piece features a 7 ply construction of alloys and metals encapsulated between Titanium based 304 surgical stainless steel. The 7- ply construction provides fast and even heat distribution and the titanium based steel surface keeps meat from sticking without making use of grease as a result of its nonporous properties.