Pre-seasoned with flax oil for a natural non-stick finish and easy to clean. Heavy duty ¼ inch (6mm) thick black iron plate. Durable 99.1% pure iron with sturdy brass rivets. Suitable for high temperatures, resists warping and buckling. Perfect for use in the oven and on all hobs including: ranges, electric, gas, halogen, induction and charcoal or wood fired open flames.