Disposable liquid ink roller V50 Liquid ink roller, liquid ink conforms to ASTM D-4236 Tip: Stainless steel arrow tip Ball: 0.5mm/0.7mm/0.38mm Clip: Plastic Ink color : Blue, black, red, green Proposed packing: 12pcs/dozen box, 864pcs/carton Advantage: Precise writing smooth to the last drop of ink at any angle, ideal for both office and students.  Large ink volume, extra long writing distance