This 4 pack of Staedtler Whiteboard Markers is ideal for the classroom, workplace or home. The markers have an innovative ink technology that allows you to leave a marker uncapped for days at a time without it drying up. The chisel tips allow you to draw a fine line with the 2 mm part of the nib or a broad line with the 5 mm part. The polypropylene barrel and cap ensure that the marker lasts an extremely long time as PP has a high resistance to ink evaporation. The ink can be dry-wiped without leaving residue on whiteboards and smooth surfaces like glass and porcelain. The marker's locked tip will stand up well under strong hand pressure. The ink is toluene and xylene free for your peace of mind.