This 40-ounce leak-proof lid is made of BPA-free food-grade plastic, odorless and reusable, suitable for daily use. It allows you to enjoy the Stanley 40-ounce insulated cup. The foldable straw design is convenient to open and close. Whether you are exercising or traveling, you can drink at any time. It can also effectively prevent dust from entering the cup, allowing you to enjoy your drink with peace of mind.(Black)