Personalized Tuba Nut T-Shirt. An acorn nut holding a sousaphone is a humorous musical instrument gift design to tickle the funny bone of low brass musicians in concert, tuba choir and marching band. Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.