Pica VISOR marker set 4 VISOR board markers (red/green/blue/black) Can be removed dry without leaving any residue, even after weeks (on all smooth surfaces)Exchange the gel refill in secondsEcologically sustainable – no (marker) wasteExtremely durable - 1 lead replaces up to 5 conventional ink markersAlways full performance – from the first to the last strokeSuitable for whiteboards, glass, flipcharts and blackboards