Jagwire lined End Caps Upgrade your cable housings with Jagwire Lined End Caps. Available in either 4 or 4. 5 mm, these end caps provide quality, low-friction performance. The Lined End Caps are perfect for those who want to protect and preserve their cable coating from dirt and trail debris due to its internal sleeve that extends out from the end. Features Internal sleeve protects the inner cable Aluminum alloy 4mm or 4. 5 mm Bottle of 50 | Jagwire | 4Mm Lined End Cap | Black | 4Mm, Bottle 50