The Shimano E-Tube Wire Holder is the perfect way to manage your internally routed Di2 system. We all love the Shimano Di2 line, but rattling cables can be a pain as you ride. These wire holders allow you to simply gather those wires up and keep them from bouncing around within your frame. This pack comes with 20 so you will have plenty to manage your system for years to come. The Shimano E-Tube Wire Holder is an ideal system for wire management.