Personalized Mechanical Heart Long Sleeve T-Shirt. A mechanical gear heart design to tickle the funny bone of your mechanic or mechanical engineer at birthdays, holidays, graduation and Valentine's Day. 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