Sakura Gelly Roll Glaze pens are a superb rollerball pen with a unique ink that creates a 3D embossed shiny line. The ink is water resistant and takes about a minute to dry although allow another two or three minutes for the ink to completely dry. They are suitable for writing on smooth surfaces including acetate, cardboard, coloured paper, glass, plastic & metal. The 3D raised effect works best on non porous smooth surfaces. 12 pens in a box.