Calphalon Unison Nonstick 10-inch Frittata Pan Set Heavy-gauge hard-anodized aluminum with three interlocking nonstick layers provides excellent heat conduction and uniform cooking; exterior won't chip, peel, stain or scratch. Durable nonstick interiors for flawless release and convenient cleanup. Innovative interlocking pans can also be used separately: the base pan for frying foods and making omelettes, the shallow top pan for preparing crepes. Dishwasher safe. Made in USA.