Stainless Steel Tray Stainless Steel from Le Creuset's 3-PLY Series consists of three layers. The tractor boiler has an aluminum core enclosed in two layers of stainless steel, which creates optimal conditions for efficient heat conduction. Combined with the depth of the boiler and the sealing cap, makes the tractor boiler particularly suitable for traditional sautering, poaching and brazing. The unique design with the 3 distinctive rings in the lid matches Le Creuset's iconic cast iron pots, and details like the heat-resistant handle and drip-free edge make the pot very user-friendly. The 3-PLY boiler can handle machine dishes, all types of cookers including induction hobs and up to 260 ° C in the oven.