Permanent universal pen M set of 4. Universal pen suitable for almost all surfaces. Excellent smudge and water resistance on almost all surfaces. Wedge tip with 1 mm line width. Suitable for overhead projection. Dries within seconds and is also ideal for left-handers. Set with 4 different colours. Universal pen suitable for almost all surfaces and overhead projection. Permanent, low-odour ink with high colour brilliance. PP barrel and cap guarantee a long service life. The pen can be left open for days without drying out. It also prevents leakage on aeroplanes thanks to automatic pressure equalisation.