Pentel Refill for K105 Hybrid and K116 Hybrid Gel Rollers, Fine Line, Permanent Blue Ink, Box of 12 (KF6-C) The best qualities of liquid and gel ink are blended into a super-smooth ink and delivered via an exclusive ink/tip technology Intense, acid-free ink dries quickly 0.5mm metal tip produces fine lines Box Includes 12 Refills