Material: Cast Iron. The cast iron is sturdy and durable for years to use.Suitable for use in the oven, on the stove, in the grill and on barbecues/campfires.Fits for ovens either round shape or square shape, either with a four-grate or a five-grate stovetop hob.No More Tipping Over on Stovetop This trivet will sit on your hob grates and reduce the space above your burner allowing for smaller pans / moka coffee makers.[Please Check Your Wok Size Before Purchasing ] Dimensions: Outer Ring Diameter 17.6cm; Inner Ring Diameter 16cmColour: blackMaterial: cast ironSize: outer diameter 17.6cm, inner diameter 16cmPackage Contents:2 x wok rackOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.