Shimano Dura Ace 900 polymer brake cable 2000 mm

I specify that to mount and tighten it, you need to be equipped with a torque wrench (for me, we must have one if we own a carbon bike). I've already seen pros over-tightening these cables which indeed fray. I perform a tightening of 5 Nm max on my Dura-Ace 9000/9100 and it's perfect. Lifespan of 5 years. (Translated review)

The polymer tends to fray and blocks at the cable housing stops. (Translated review)