Liquid ink roller T800 Free ink roller, liquid ink conforms to ASTM D-4236 Tip: Stainless steel needle tip and conic tip Ball: 0.5mm/0.7mm/0.28mm/0.38mm material: plastic Ink color : Blue, black, red, green,lime, L-blue,pink, purple, brown,orange.... more than 20 colors available Proposed packing: 12pcs/dozen box, 864pcs/carton Advantage: Muji feeling apperance. Precise writing smooth to the last drop of ink at any angle, ideal for both office and students writing and drawing.