Shimano Sealed Outer Cap Växel

With this Shimano Sealed 4mm Derailleur cable end cap, there will be much less dirt in your cable. This will keep your shifting smooth for a longer time, which prevents a lot of annoyance while cycling.
This cap is made of aluminium, which makes it both lightweight and durable. If this cap is still undamaged, you can simply transfer it to a new cable.