Stainless steel coffee cups are typically manufactured using either 304 or 316L stainless steel. 304 stainless steel-also known as 18/8 stainless steel-contains 18% chromium and 8% nickel, offering excellent rust and corrosion resistance, ease of cleaning, and structural stability. 316L stainless steel builds upon the 304 grade by adding molybdenum, which further enhances corrosion resistance and chemical stability, making it a superior-grade material. Both materials ensure high product quality and excellent heat resistance; they remain shiny and like-new even after long-term use and are safe for human health. When purchasing, consumers are advised to check whether the product is made of 304 or 316L stainless steel and to consider factors such as brand, size, and quality details to ensure they acquire a safe and durable coffee cup.