Parker Quink Gel Ballpoint Refill Medium - BlueParker gel refills fit all Parker gel and ballpoint pens apart from their 3 in 1 and multi function writing instruments. These refills also fit many other makes which use this standard international Euro size shape. They contain advanced ink technology for consistent, high quality writing, smooth lines and intense colour. Writing length approximately 600m, line width 0. 7mm. Features Line size Medium Product colour Blue Suitable for pen type Gel pen