Waterman pens are only compatible with their own refills i.e. they are not international standard size. We find their ballpoint refills to be one of the smoothest (available in blue and black ink), and if you need unusual colours such as purple and green, we also stock a Monteverde Waterman style refill. Their rollerball refills are only available in fine tip, whilst ink cartridges come in packs of 8. If you require replacement leads for your pencil, make sure you choose 0.5mm width (available from Parker or Cross).