AirBake Nonstick 2 Pack Cookie Sheet Set, 14 x 12in and 16 x 14in Air insulated heavy weight aluminized steel sheets helps prevent burning Micro-Dome technology decreases bake times by up to 15-percent Non-stick finish Set includes Medium & Large Cookie Sheet 10 year warranty 100% aluminum construction. No more burningGuaranteed! Guaranteed not to rust. Micro-Dome technology. Dishwasher safe.