Multiliner SP inking pens are pigment based, and provide the highest quality for all your inking needs. Ink cartridges and replacement nibs are available so you never need to throw these durable aluminum bodied pens away.  This set contains 4 Black Multiliner SP ink pens; Sizes 0.03, 0.1, 0.3, 0.7 in a hard, plastic case Multiliner SP Features: 

• Pigment-based inking pens
• Refillable with SP refill cartridges
• Black 10 sizes - including 0.03mm thru brush
• Colored Multiliner SP's in 12 colors and two nib sizes
• Aluminum body
• Waterproof & archival
• Compatible with Copic Markers
• Photocopy safe