These Staedtler Whiteboard Markers is ideal If you’re in a high-stakes meeting, high-school classroom, or running a university tutorial, if there’s a whiteboard up-front. The unique dry safe ink formula allows the cap to be left off for up to 48 hours without drying out. The alcohol-based pigment ink in the Staedtler has a non-offensive low odour and provides dense bold colours. The ink can be dry wiped from whiteboards and surfaces like glass and porcelain without leaving a trace. This lock tip, PP barrel and cap guarantee long service life as well Airplane-safe – automatic pressure equalization prevents pen from leaking on board aircraft. This refillable Assorted colours Chisel Tips Whiteboard Markers can make Line width approx. 2.0-5.0 mm for smooth flow from the beginning to the end.