Pens (Markers, Water-based pens, Ballpoint pens) Set of 16 Line Markers HIGHLIGHTER 6 pens Water-based pens OLIVE des OLIVE 2 pens PLAY COLOR 2 6 pens HI-TEC-C (0.4) 2 pens All colors have been tested and confirmed to work. (For pens with tips on both sides, only the thicker side has been tested) These are used items, so some may have less ink. ⚠️The light green and yellow line markers have soft, thick tips. The orange marker, red water-based pen, and HI-TEC-C have stains. The blue HI-TEC-C pen tends to accumulate ink at the tip, and there appears to be air bubbles in the ink.