Morning Glory Mach Roller Ball Pen Tank System - 0.4 Mm- (Pack of 12) (Black) The Morning Glory Mach Pen is a roller ball pen with an undeniably modern and stylish look. Korea is another Asian country that is famous for high-quality and often times cute stationery. One of the newest pens just released is the Mach Pen. The pen uses a tank ink cartridge that can supposedly write over 5000 m (we haven't tested it). Black / Blue / Red / Mixed (Pack of 12 Pens) If you choose the mixed color - Blue 4 / Red 4 / Black 4 Pens - Shipping