• Unique design since 1971 Stabilo effective protection against drying: Effective protection against drying for up to 4 hours for your concentrated work Stabilo BOSS original with 9 magnificent phosphorescent colors 2+5 mm 2 line width is suitable for drawings or texts with different thicknesses Refillable Water-based ink Budget-friendly and very easy to refill Having a good quality means that the tip will last for a long time.