Personalized Trombone Rocks Long Sleeve T-Shirt. Trombone Rocks with three dancing rocks holding trombones is a humorous low brass design. Fun gifts for musicians at back to school, marching band, birthdays, holidays and graduation. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL