Made with an aluminum core clad in stainless steel, GreenPan's Valencia Prio cookware is rugged and warp-resistant and provides excellent heat distribution and retention. Mirror-finished on the exterior with a brushed matte interior, the uncoated cookware in this 10-piece set is durable, non-reactive and easy to use and care for. Glass lids seal in heat and moisture while letting you keep an eye on your meal's progress, and riveted, ergonomic handles make it safe and comfortable to transfer pots and pans from stovetop to oven to table.