Sakura Gelly Roll Moonlight Pen Set, Medium, 5-Colors, Dawn. Gelly Roll Moonlight Pens shed light onto art works, school projects, memos and more. The ultra vivid, opaque inks are luminous on light or dark paper and on most porous surfaces. These fluorescent colors glow under a black light for added effect. This set includes Fluorescent Yellow, Orange, Vermillion, Pink and Green.