I remember one of my middle school friends had tons of long, blond-brown arm hairs, and one day he showed us a single black hair growing out of all the blond ones. It was preeeetty weird!
the fur on my arms is different in places. They're at least four inches at the start of the forearm, but only one at the wrist. My fur is longest on the under sides of my arms, though, six inches at the elbow, three at the wrist