The refills for the Zebra Sarasa4 represent the epitome in quality ink refills,
second only to perhaps the Uni Jetstream multi-5. The ink is smooth, quick
drying, dependable, bold, and vibrant. I use the green ink for grading, which my
students appreciate and enjoy. The ability to refill the Zebra Sarasa4 has
brought down the expense for my grading pens and JetPens' amazing prices,
products, and incredible customer service makes the previously frustrating
experience of having to find/purchase quality grading pens one that I look
forward to after grading a ton of papers.