The pens are refillable and included in Pilot's BeGreen assortment

Ideal for bold notes

the cheapest alternative will always be buying your pencils in sets like this one

The metal rollerball applicator works best with thick paint (not ink)

krink k 12 permanent paint steel ball marker multivariantcolorpicker The pens are refillable andA marker with a 2 mm metal ball tip and a soft body so you can control the flow of paint by squeezing the marker. The KRINK K 12 markers are filled with a thick oil based silver paint that works on most surfaces. These markers were originally made for industrial labelling, but KRINK has adapted them for graffiti and urban art.