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
Refillable. 
Line width for Medium ( M code)  tip approx. 1.0 mm, for  Fine ( F code) tip approx. 0.6 mm
    4 Color set include color : 2,3,5,9
    6 Color set include color : 2,3,5,9,4,7
    8 Color set include color : 1-9