Aluminum core for excellent heat conductivity， hard-anodized for durability and anti-corrosive properties， with a touch of pure ceramic on the inside and outside. Vacuum seal food for stewing and one-touch release valve to open. Aerospace Alunite Body for durability and strength One touch Vacuum Control Valve Safety Lock incorporated into the Handle Silicon Packing draws air out and forms tight vacuum inside the pot Self Standing Stainless Steel Lid Included