Sheaffer ‘K’ Ballpoint refill, available in both medium and fine points, available with Black or Blue ink. Fits most Sheaffer ballpoint pens, not compatible with Sheaffer Sagaris or Taranis ballpoint pens. This high-quality Sheaffer refill is perfect for use with Sheaffer ballpoint pens. These are renowned for been highly reliable, long lasting and convenient for use on all paper.