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The On The Run Stainless Marker is one unique marker. What makes this marker special is that when you write on different surfaces is creates different finishes. Meaning, if you write on a porous surface, the marker will appear metallic. And when you write on non-porous surfaces, the finish appears to be black. The On The Run Stainless features a replaceable 20mm T-nib. It also has a pump action valve that gives you control over the flow of ink. This marker is also refillable.