Replacement Ink Cartridges hold 2ml of OLO alcohol ink. Marker caps, Nibs, and Connector Rings are not included with Replacement Ink Cartridge. However, additional OLO Connector Rings, replacement nibs, and other accessories are available. Marker bodies are color-coded for quick nib identification. All OLO nibs work with all OLO Replacement Ink Cartridges.
Calling a colorless blender a "blender" is misleading as it does not allow for traditional blending techniques. The importance of this marker is in the absence of color, hence the name ZERO. Use ZERO with OLO to dilute color, add texture or minimize mistakes.