This custom printed mug is an excellent gift for your favorite tractor driver. Whether that is dad, grandpa, uncle or anyone special in your life. Your Personalized "I Dig My Kids" Coffee Mug is dishwasher safe and includes free personalization. We will personalize this Tractor Mug for Grandpa with any title and up to 12 names. This ceramic mug holds 11 ounces of your favorite drink.