Uni-ball Jetstream Fine Point Roller Ball Pens Refills for Multi Pen Type -0.7mm-black Ink-value Set of 5 Fine Point-0.7mm- Writes amazingly smooth while providing crisp, vivid lines Quick-drying ink helps prevent smearing - perfect for left-handed writers Conformity number/SXE-3-400/MSXE-500/MSXE3-1005/MSXE5-1000/MSXE-2005 Keep in mind that it does not fit normal Jet Stream.