Personalized Intelligent Cello Youth Long Sleeve T-Shirt. Cello, the instrument for intelligent people with the image of a cello is a humorous orchestra design with attitude for string lovers at back to school, birthdays, holidays and graduation. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)