Never Used but there's sticker residue on the bottom (see picture) Material Ceramic Locking Plastic Lid - A secure locking lid with a skid-resistant bottom helps to prevent leaks and spills when you’re out on the road. Spoontiques mugs fit in most vehicle cup holders. Stands 6 ½” tall and holds 18 ounces of liquid. Microwave Safe, Dishwasher Safe