Regarding this project Our single-walled water bottles are made of 304 (18/8) stainless steel and are 100% free of bisphenol a and plastic. They are a healthier choice for you and the planet. (Note: Single-wall design without insulation. Please be cautious when using hot liquids.) The sturdy stainless steel bottle cap features a safety thread design and a comfortable silicone ring, which can prevent leakage even when tilted or shaken. Take it for hiking, cycling or to the gym, and don't worry - your bag will stay dry and your drink will stay fresh [ Convenient to carry around ] The large opening can easily hold ice cubes, fruits or tea bags. Lightweight and portable, suitable for most cup holders, and comes with a convenient hanging ring - perfect for the office, travel, or outdoor adventure, meeting your hydration needs. The perfect gift or storage for the entire family [ Guaranteed Satisfaction ] Proud of its high-quality metal water bottles. If you are not entirely satisfied, please contact us to obtain a worry-free solution