Nokon Shift or Brake Cable Casing Set
Nokon offers this cableset that includes 2 derailleur cables and 2 brake cables but only enough housing to set up one or the other. You will need to purchase extra external housing or two kits for a full cableset replacement.
The essence of their design is to minimize and even eradicate cable housing compression for the absolute best shifting or braking - which it achieves. This is done through alloy cable housing that is very cleverly ball-jointed. Inside the Ball-jointed alloy housing lies a Teflon liner which the cable slides back and forth in. The Teflon does a great job in keeping dirt out and most importantly reduces friction. Weight savings is approximately 40% lower than standard cable/housing sets and service life is doubled.