Jagwire Racer Complete Road Brake & Derailleur DIY Kit, SID Blue;

Cables are probably the least-appreciated part of your setup, but they're more important than most of us realize. A smooth, strong, and reliable cable makes shifting extra crisp and braking that much more powerful, so adding something like the Jagwire Road Pro Complete Shift and Brake Cable Kit to your bike is an easy and cheap way to freshen up your ride. Jagwire cables are coated in Teflon and placed inside slick-lube liners, so you get smooth shifting and braking without any grabbing, soft spots, or delay. This kit comes with everything you need, including cable ends and barrel adjusters, and has enough color options to add some pop to any bike.