Housing ends need reinforcement where they meet frame stops, barrel adjusters, and cable guides. Without a ferrule, the cut end of housing can deform or fray under compression, which changes how the cable pulls and degrades shift or brake feel over time. Jagwire's 5mm ferrules slip over the end of cut housing to create a stable termination point that maintains consistent cable alignment. The polished alloy construction resists corrosion from road spray and weather exposure, which matters when ferrules sit exposed at frame stops or under-the-bar cable routing.

The ferrules use vertical grooves instead of a smooth bore. These grooves bite into the housing outer casing to create grip without requiring crimping, which means you can remove and reuse them if you need to adjust housing lengths during a build or troubleshooting session. The small flange at the base prevents the housing from pushing through under cable tension, and the tight manufacturing tolerances ensure the ferrule seats flush against stops without wobble or play. If you've ever dealt with loose ferrules that rattle or shift position, you'll notice the difference when these seat properly against your frame stops. The non-crimping design also means you're not permanently compressing the housing, which can restrict cable movement if you crimp too aggressively.

Standard 5mm sizing fits both brake and derailleur housing on most road and mountain bikes. If you're running full housing to the brake caliper or through frame routing that terminates at a derailleur hanger, these ferrules finish the housing runs properly. The 10-pack gives you enough for a complete bike cable refresh with a couple spares for future adjustments or trail-side repairs.