Personalized Mechanic Skull T-Shirt. Mechanic skull! An angry skull with an open end wrench and socket wrench instead of crossbones, and metal wings behind it all. Cool gift for your favorite mechanic! 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.