What is MTB/roadbike specific in brake cables?
The difference is the lump on the end that engages with the brake lever.
(right) A flat bar lever generally looks like a small cylinder or barrel, with the wire coming out the side.
(left) A drop bar lever is more of a &quot;droplet&quot; shape with the wire coming out the axis.  Campagnolo ones are different again.

This wire comes with one on each end, and you cut off the end you don't need.  Reduces the stock/inventory count and increases convenience, but it a little wasteful.