Positives:
- Even without extra lighting 1a visibility on black glass board
- Tip can be rotated by 180 ° use, thus fine or thick line width possible
- Can be in spite of their very good opacity effortlessly (dry) to wipe
- Even the white pin covers well
Negatives:
- Viewed priced rather expensive, but everyone must decide for themselves
- With hard pressure to the tip slightly frayed
