Tell him or her you think they're the best in the whole world with this adorable "World's Best" mug. Below “Worlds Best”, we personalize it with any title ( Dad, Mom, Aunt, Uncle, Grandma, Grandpa, etc.) up to 12 characters. On the back, we add any name up to 10 characters. Our ceramic mugs are microwave and dishwasher safe. Available in 11 oz. or 15 oz.