Highlighter PVP636 Refillable Liquid ink Highlighter PVP636 Flourescent ink conforms to ASTM D-4236 Tip: polyester chisel tip Ink color :10 colors available. Yellow, orange, pink, blue, green, berry, corel, indigo, red, purple Proposed packing: 12pcs/dozen box, 576pcs/carton Advantage: The highlighter has flourescent ink marking capabilities. The water based ink and the polyester nib make smooth and clear fluorescent marking on all kinds of paper. Free ink system guarantee smooth writing to the last drop of ink. The refill can be replaced after you use up the ink.