Forestry Labs Stainless Steel and Bamboo Insulated Mug - 9oz DOUBLE WALL INSULATED - keeps your drinks colder or hotter longer. It also prevents "sweating" on the surface for cold drinks and burning your hands for hot drinks ECO FRIENDLY - bamboo exterior and handle adds a touch of nature to your day. There is no artificial finish so you can feel the natural grains of the bamboo QUALITY MATERIALS - this mug is machine washable, but hand-wash to prolong the bamboo exterior. Stainless steel is food grade with a BPA free lid that is lined with silicone for a seal. Please note: the lid is not 100% leak proof . It will prevent splashes. Great gift for tea and coffee lovers. 9OZ - a modest cup of coffee. Great for someone who won't mind refills :)