Cork Bottom Design: The cork base of the black 11.8oz mug not only prevents scratches on the surface of the table but also prevents burning hands. Please note that mugs are not safe in the microwave and oven, and remove the detachable cork base before putting them in the dishwasher. Stronger Handle and Easy Cleaning: The ergonomic design of the handle ensures a comfortable grip, while the cork bottom provides stability on any surface. These mugs are easy to clean and suitable for hand washing. perfect for daily coffee, milk, water, tea, latte drinking in different occasions. Enjoy your favorite hot or cold drinks in style with these insulated coffee cups. It will be a special gift choice for Thanksgiving day, Valentine's Day, Christmas, fathers day, anniversary, wedding.