The universal pen that does not dry out. Refillable universal pen for overhead projection and almost all surfaces. Dry Safe: can be left open for days without drying out (ISO 554 test). Airplane-safe automatic pressure equalisation prevents the pen from leaking on the plane. Excellent smudge and water resistance on almost all surfaces. Dries in seconds. Low-odour, xylene and toluene-free ink with maximum colour brilliance. Lightfast colour. PP barrel and cap guarantee a long service life.