Non-permanent universal pen M - Universal pen for use on almost all surfaces - Suitable for overhead projection - Can be wiped off film using a damp cloth - Water-soluble ink - Fast-drying - PP barrel and cap guarantee long service life - Airplane-safe - automatic pressure equalization prevents pen from leaking on board aircraft - Stand-up STAEDTLER box - Superb colour brilliancy - Lightfast colour black - Line width medium approx. 1.0 mm - Refillable