Hybrid Nonstick and Black Ceramic Coating-this skillet consists of three layers construction-two layers of stainless steel and one aluminum core.The newly honeycomb etching and black ceramic coating process are applied to the pan surface, which makes it truly non-stick, scratch-resistant and corrosion resistant, discolor will not occur. Free of PTFE, PFOA, PFAS,non toxic, durable and healthy. It Comes In One Piece Without Assembly-There are no inside screws or bolts at inner pan, no dirt hiding,non-yellowing,easy cleanup. Cooking can be easily monitored by the glass lid.The hole in the lid lets steam exit easily. The bottom of the pan is as thick as the side ,heat spot will not occur. The thoughtful knob brings durable stability and stay cool feeling. Compatible with All Cooktops-This stainless steel pan is friendly with induction cooktop, gas stovetop and electric stove, tri-ply stainless steel structure brings better heat distribution and longer heat preservation than usual