Uni-ball Signo (ユニボール シグノ) UMR-5 Set of 2 replacement ink refills! For capped pens / Ball diameter 0.5mm Ink color: Blue Black Compatible with: ・Uni-ball Signo UM-100 ・Uni-ball Signo GP UM-115 I purchased these by mistake, so I am selling them. * One refill has been opened, but the protective plastic ball on the tip is still attached, and it is unused. The other refill is unopened. Stored at home. Thank you for your understanding! #Mitsubishi #MitsubishiPencil #Uniball #Uni #uni #UniballPen #Signo #signo #GelInk #Refill #Cartridge #BallpointPen #Pen #WritingUtensil #Stationery #StationerySupplies