Sketching pens with water and alcohol resistant ink. Perfect to use with Copic markers, they are available in a variety of sizes and colors.
Copic Sketch 12 colors set - COPIC Official Website
Alcohol Resistant Copic Drawing Pen - COPIC Official Website
Copic Sketch 6 colors set Portrait - COPIC Official Website
Copic Ciao Hatsune Miku Set - COPIC Official Website
Copic Markers, Official US Site and Store
Introducing the new Copic Multiliner CM and CS - COPIC Official
Sketching Pen from Copic, Copic Multiliner SP - COPIC Official Website
The most popular Copic marker - Copic Sketch - COPIC Official Website
Copic Refillable Multiliner SP