Product Details Producer: BOOK Friends Origin: Korea Production line: Korea Size: 8 mm x 170 mm x 40 mm Material: Silicone Type: Ballpoint Pen with a sprout shaped charm on the top Ink color: Black, made by Dokument Germany. Ball diameter: .7 mm Product Description Sprout Pen Set is 8 black ball point pen in a set. Sprout pen has a sprout shaped silicone charm on its top. The sprout charm can be used as an earphone slot stopper for a regular 3.5 mm earphone slot. Yellow, green, blue and violet colored pens' sprouts are glow-in-the-dark. Sprout Pen uses ink made by Dokumental, Germany. A set contains 8 colors: red, pink, white, blue, yellow, green, light green and violet.