New, instant purchase OK. Pilot Water-based Knock Type Refill 0.5 mm LVKRF-10EF- Black 5 pieces This is a water-based ballpoint pen refill with a 0.5mm ball diameter that can be used for V-cone Knock and V-ball RT. Water-based ballpoint pen refill Black (B) LVKRF-10EF-B 4902505376900 Thank you.