This looks like a stainless steel line, because it's actually 7 twisted strands.
This is ideal for a throttle or parachute release cable where a steel cable is housed in a jacket.
Another great use would be for trucks needing cables for tie down or tow trucks.
The wire core is springy and doesn't droop like a soft line and it isn't rigid like an aluminum line.
This stranded line equals the following equivalent 1:1 size at each scale.
1/25 scale = 1/2"
1/16 scale = 1/4" or 5/16"
1/12 scale =1/4"
1/8 scale = 1/8"
Each package contains one coil of .019" x 12" stranded line.