4.0mm, 3/16" thickness Durable 4mm thick aluminum core ensures long-lasting performance with constant heating 3003 Aluminum for superior heat distribution Riveted handles designed for strength & durability Spin-formed fabrication Hand wash - Aluminum products are not dishwasher safe;CLEANING & MAINTENANCE: CAUTION: allow product to cool before washing Wash aluminum products with warm water, mild soap and a soft, non-abrasive sponge After washing, immediately and completely dry with a cloth/paper towel to prevent limescale from forming To remove cooked-on food residue, boil in water with vinegar for 4 to 5 minutes to loosen, then follow steps 1-3 to wash, rinse & dry.