The Fudenosuke brush pens from Tombow feature flexible brush tips that allow smooth transition from thin to thick lines by altering the pen pressure. They feature water-based pigment ink that provide vibrant colors, which will not bleed through most papers. These pens are ideal for beginner hand lettering, brush calligraphy and illustration.Details: Includes assorted colors6.1" x 4.7" x 0.6" (15.494cm x 11.938cm x 1.524cm) 6 packs (10 pens per pack, 60 total pens) Water-based pigment ink Non-refillableUse with smooth, non-textured paperPack Contents:RedOrangeYellowGreenBluePurplePinkGrayBrownBlack