Sharpie 13401 Trace Element-Certified Ink Marker, Black (Pack of 12) Contains trace element certified ink. Meets requirements for trace element certified ink for the nuclear energy, aerospace, electronics, aeronautic and ship building industries. Permanent ink delivered from a fine tip. Each marker is identified with the batch number of the ink. 0.688 inches long by 2.438 inches wide by 7.625 inches high. 0.055 pounds. Made in the USA.