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.