30cm (12 inch) wok diameter. 100% Hand Made. Hand hammered and processed by traditional kraftmanship through multiple days. You can recognize hand hammered surface, but still smooth by thousands of hammering. No Worry about Stick : There is no coating. Still non-stick. Reactive Iron Material will from protective layer when used. The longer you use, the better wok works. This Wok is pre-seasoned. Blue black wok is fully prepared while white woks need season process. You can just wash with water and start to use. Ideal size for restaurant & Home : 36cm (about 14.20 inches) is best size for professional chefs. This is good size to cook for 6~7 dishes. 30~34cm Woks are for home use and mid size restaurant orders. Depth from bottom to top : 4 inches INSTRUCTIONS: Wok is NOT recommended being in dishwasher so that the seasoning isn't removed during cleaning. It is for gas stove. Its bottom is not flat for electric heat.