Selecting premium copper cookware requires evaluating material thickness, lining type, and handle construction. For professional performance, prioritize a thickness of 1.5mm to 2.5mm; anything thinner may warp under high heat, while thicker pieces become too heavy for agile kitchen work. Ensure the lining is made of stainless steel for durability and ease of maintenance, or traditional tin for superior non-stick properties (though tin requires re-tinning over time). Verify that handles are securely riveted (not welded) and made of materials like cast iron, stainless steel, or bronze to ensure a cool grip and long-term structural integrity.