AQR-7 AquaRoller Refill. 0.7mm Fine point.  Black Ink.
(Parker-Style Compatible)
 
 
  AQR-10 AquaRoller Refill. 1.0mm Medium point.  Black Ink.
(Parker-Style Compatible)
 
 
  AQR-10 AquaRoller Refill. 1.0mm Medium point.  Blue Ink.
(Parker-Style Compatible)
 
 

Parker is a registered trademark of Newell Rubbermaid, Inc.