13th Birthday Gifts For All Now That I'm 13 Officially Know Everything Gift Coffee Mug Tea Cup Blue The best 13th birthday gift is a practical gift they can use for years to come. This 11 ounce white ceramic coffee mug also makes a great tea cup with its large, easy to grip C-handle. The imprinted design will display on both sides of the mug as pictured, and will stop approximately 1 inch from both sides of C-handle. The premium full color sublimation imprint creates a vibrant, long lasting, and lead-free design. Microwave and dishwasher safe for your convenience.