Kirameki Pure Iron Double Fiber Line Stir-fry Wok (Made in Japan)Kirameki Cast Iron Double Fiber Line Stir-fry Wok (Made in Japan) is proudly made in Japan, recognized as a "dream frying cast iron wok" that keeps the best part of iron fry pan while keeping rust away and maintenance easy. The inside and outside sides of iron material are special processes with fiber-like concave-convex. This feature differentiates this stir fry wok from other local products. It is a metal series produced in Tsubamesanjo, Niigata Prefecture, known for its excellent metal processing technology and extremely advances in this era.It comes up with a wide surface area to receive heat due to unevenness and double fiber line design, heats up to the core of the food at once, and traps umami. Double fiber refers to a double fiber line technology applied on the surface of the wok; it helps to heat up to the core of the food at once and traps umami. It is a product compatible with IH, Gas and Induction Cooktop.Specifications High-quality cookware by Kirameki - 100% made in Japan. 99.7% High purity Iron Wok. Wooden handle, anti-scalding and non-slip Not easy to stick and not easy to rust Surface guaranteed not to peel, blister, or crack when heat is used. Fast heat distribution, not easy to rust Lightweight and durable compared with other traditional woks Caution: While using the electric, glass-ceramic, halogen, induction stove, the wok will change its shape but go back after it cools down. It is normal. Gas is the best choice with the best performance.Differences between Double Fibre vs Nitriding Processing WokThey are both lightweight cast iron woks. Double fiber refers as a double fiber line technology applied on the surface of the wok, it helps to heat up to the core of the food at once and traps umami. And Nitriding is a hardening process on top of a double line fiber surface where atomic nitrogen is introduced into the surface of a ferrous alloy. It helps to maintain the hardness of the work itself. It enables the wok not easier to rust and damage. Nitriding wok is also a pre-seasoned wok which is an upgrade version of double fiber line wok to help you achieve the delicious "wok hei"? in Asian cuisine.Warranty / Change of Mind Return & Refund Policy: If you're not satisfied with your purchase, you can return it within 30 days for a refund. The product must be in its original packaging and unused. Please contact Dropshipzone customer service to start a return. Please note that the initial shipping fee is non-refundable, and the customer is responsible for covering the return shipping cost.