Trinitite embed on a gold rollerball. Trinitite is the glass that was formed during the Trinity nuclear bomb testing in 1945. Now, unfortunately, trinitite doesn't glow under black light like uranium glass does but some species of wood does. The body of this pen has been turned out of black locust which is one of those species. Accepts standard rollerball refills as well as the Pilot G2 gel refills.