The Maxifl o Flex-Feel marker has a flexible brush tip that draws both thin and thick lines, so one product combines both properties and allows writing in a wide range of thicknesses from 1 to 5 mm.o Flex-Feel marker has a flexible brush tip that draws both thin and thick lines, so that one product combines both properties and allows writing in a wide range of thicknesses from 1 to 5 mm; bright colours to the last drop of ink; for white or porcelain boards; washable, a dry cloth or sponge is sufficient; the length of the writing line is 850 m; writing line thickness 1-5 mm;.