Ben Harper, bike messenger in New York City, with his Franklin bicycle. 
Ben Harper, bike messenger in New York City, with his Franklin bicycle.  - 
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As part of our series Pro Tool, we're looking for that must-have device in your line of work, be it a pair of scissors, notebook, or microphone

The sixth item in our series? A bicycle. 

Professional: Ben Harper, New York City bike messenger. 

Pro Tool: Steel-frame, fixed-gear Franklin bike. 

Why it's a Pro Tool: "Steel, I've come to find is the most durable, soaks up a lot of the shock ... even though it's got no paint left on it and it's all dented — it just goes and goes and goes and goes."

Click the media player above to hear more.

Additional production from Justin Ho.

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Follow Katie Long at @katieplong