The new Emulsion ink from Zebra combines the best quality of a ballpoint and gel ink pen. It has the smoothness of an oil-based ballpoint ink pen but features the vibrant colors of a gel ink pen. That's an incredible development. The Emulsion is supposedly even smoother than "low friction" ballpoint pens, is smear-proof and water resistant. The Zebra Surari is available in multiple tip sizes and colors.