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Each OLO™ marker contains 4ml of ink - nearly 2x more usable ink than any other alcohol marker. The innovative design of the OLO Connector Ring lets you combine different color ink cartridges for more compact storage and convenience when traveling.
OLO’s patented cartridge free-flow ink system maintains consistent, controlled ink flow throughout the life of the ink cartridge. As a result, OLO provides you with more usable ink than any other alcohol-based marker.
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