This 15.5 Qt covered stock pot is perfect for all your large cooking needs. It's constructed of dark porcelain surface and steel core absorb energy to heat rapidly. There are no PFOA's or other chemicals to alter food's taste, color or healthfulness. Porcelain is fused to the steel at 2,000 degrees Fahrenheit producing a non-porous, inert glass surface that is naturally non-stick. Porcelain can chip if dropped, however this does not reduce the effectiveness of the cookware. It creates a smooth, hard finish that won’t burn and resists staining. It’s also non -porous so it won’t trap odors or food particles and provides a low coefficient of friction – meaning that it cleans up easily and, it is corrosion and chemically resistant so it will last a long time. When fired, the vessel is placed on pins so the bottom and sides are hardened during the firing process into one smooth laminated glass surface. You may notice slight pin indentations where the glass has flowed around the pin that supports the base during firing. The pin marks do not compromise the finish or performance of the vessel. Not recommended for glass cooktops.