Water Soluble Marker: Blue, Broad TipLumocolor non permanent pen 312 3 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 Superb colour brilliancy Line width medium approx. 1. 0 mm or 2. 5 mm Refillable