Bottom: SIGMABOND® patent of pressing technology for cookware bottom; Handles: designed by well-known Italian designer Matteo Thun; the distance between handle and cookware body makes cookware suit to induction range and also to gas range; Lid: dome lid with groove rim, avoid steam dripping down; it increases the volume of pot; Surface polishing: treat inner side with smooth-satin to prevent from scorch; Body: complete wok body is of three-layer compound structure. Inner and outer layers are stainless steel; Middle layer is aluminum; warm-keeping function for energy-saving and environment protection.