I saw those at Jensen, but nothing says whether they are brake or derailleur ferrules. In fact, I can't find a retailer that makes a distinction between brake housing ferrules and derailleur housing ferrules.

By the way, I was waiting at a red light late last night on my bicycle, and all of a sudden I heard a huge crash. I looked up, and a car going 25-30mph had plowed into two cars waiting for a red light. The car then backed up, pulled a U-turn and drove away with a smashed hood and smoke billowing out of the engine. Some good samaritans chased the car down and reported the license to the police. The police eventually caught the driver, and they arrested him for drunk driving. I shudder to think of what might have happened if the drunk driver had plowed into me.