Jagwire 4mm Basics Derailleur Housing 50M File Box BlackJagwire 4mm Basics Derailleur Housing 50M File Box Black. File boxes stack conveniently on a shelf or in Jagwires file box organizer for easy access and come in a variety of different quality levels. Linear strand construction provides stiffness while remaining suitably bendable TECH SPECS Color Black Defined Color Black Housing Diameter 4 Length 50 keyword search Gift Guide Jagwire