ZIG Posterman Easy chalkboard markers let you start writing immediately. Conventional chalkboard markers need to be shaken before writing to mix the ink, and the tip has to be prossed for ink to come out. However, ZIG POSTERMAN EASY markers use a different mechanism that eliminates the need for these extra steps. Anuone can start writing easily and immediately. Eraseble from non porous surfaces with a wet cloth. Wasterbased pigment ink. The pilable tip allows you add variation to yout lines, 1,5-3,0mm writning line