Personalized Mechanical Gears Youth T-Shirt. Mechanical Engineer in gray text and a row of gears below will put your favorite engineer in gear for the day. Unique gift design for your mechanical engineer at birthdays, holidays and graduations. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.