The dynamic gel ink formula in this pen is exceedingly smooth for writing. It's water resistant; smear-proof and features a contoured rubber grip for comfort. Refillable. Individually UPC coded - except bold points. Assorted colors include: Black; Blue; Red; Green; Purple; Navy; Orange; and Hunter Green. 8Pk includes: Black; Blue; Red; Green; Purple; Burgundy; Pink; and Turquoise.