Material and Durability: These cups are typically crafted from food-grade stainless steel (such as 18/8 or SUS304), making them durable, break-resistant, and rust-proof.Design Features: They often feature a single-walled construction for lightweight portability or a double-walled, vacuum-insulated design to keep drinks hot or cold and prevent scalding.Usage: These versatile tumblers are suitable for various settings, including daily household use, outdoor camping, picnics, and parties.Maintenance: The items are generally easy to clean and often dishwasher-safe