Fine-tip permanent marker marks on most surfaces. Meets requrements for trace element certified ink. • Fine-tip permanent marker marks on most surfaces. • Contains trace element certified ink. • Meets requirements for nuclear energy, aerospace, electronic, aeronautic and ship-building industries. • Each marker is identified with the batch number of the ink. Fine-tip permanent marker marks on most surfaces. Meets requrements for trace element certified ink for the nuclear energy, aerospace, electronic, aeronautic and ship building industries. Marker Ink Type: Permanent; Marker Tip Type: Bullet; Marker Tip Size (text): Fine; Marker Color(s): Black.