Made of Corten steel, but processed in order to have a protective layer on the surface to make it weather-proof. The surface is originally greyish; due to weather conditions it turns reddish-brown (resembles the colour of rusting), which becomes darker with time. Durable material: This wood-burning outdoor fire pit is constructed from Corten steel with a rust-patina finish, making it durable and long-lasting. The unique finish is formed from its exposure to atmospheric conditions, and the rusty surface gives it an antique look. Elevated base: Equipped with a base that creates a sturdy foundation for the fire pit, ensuring stability and preventing the ground from overheating. Detachable design: The upper and lower parts of this wood-burning fire pit can be separated. To dispose of the ashes inside, simply move the upper bowl (Note: Do not touch or move until completely cooled). Spacious interior: Overall dimensions: 23.8" L x 23.8" W x 34.5" H, with an interior depth of 7", providing ample space for wood to burn longer. Tips: To speed up the rusting of the Corten steel fire pit and make the surface more attractive, spray evenly with water or salt water using a spray bottle or wipe with a cloth, then allow to dry naturally.