... heat source 2.Impact bottom,energy saving 3.Super high quality 4.OEM chinese wok:1,Diameter/Height:28 ... edge,Mirror polishing inside and outside 4,Bottom Plate:7mm aluminum with 0.5mm 430 plate for induction ... . and SGS approval ,healthy and nutrient , impact bottom to ensure quick and even heat distribution, Super high ... safe for food touching ,energy saving Stainless Steel Chinese Wok for induction