This empty marker allows you to create or expand your marker collection by using various inks to fill them up. The empty marker comes with the same nibs included as their filled marker versions. Filling a brand new, empty marker takes about 1.5 - 2cc extra ink to saturate the sponge inside the marker than if you were refilling a standard, already used marker. Paint-based inks will not work as the pores will dry out and will not flow properly. Details:Dual tip (broad chisel and fine point nibs)Dries acid freeCompatible with any thin ink or food coloring