The high-quality food grade Ace Stainless SteelSingle Layer Bottlesare now sleeker and more stylish than before. The lid is made of BPA-Free material that can be opened with a simple rotation and is leak-proof. Nanobot Ace can keep your water odour less and non-contaminated. Nanobot Acebottle is BPA- Free, made with the food grade stainless steel.