For every two different colors purchased, get a connector for FREE.
Customizable Alcohol Markers: Connect to cartridges to build your custom marker collection.
Patented free-flow ink cartridge system: Delivers consistent and controlled ink flow.
Unparalleled value: An OLO double-ended marker contains 4ml of ink (nearly 2x more usable ink than any other alcohol marker).
Out of ink? Grab an OLO replacement ink cartridge and re-use your nib and cap.