SRAM Hydraulic Line Rotating Hooks - Black - 4 Pack

3 stars as these are not cheap, but pretty much only thing available that does the job. Cable ties would also do the job, but these keep the cables separated. They will slide along the cable, which allows the cable to move when the handlebars are turned. Works fine if positioned in the right place, but won't fix every cable problem you might have.

I like these because cable ties and heat shrink hold the cables in place but do not allow movement on large handle bar turns putting unnecessary strain on cable and fittings.

These allow cables to slip while still holding them in place but it is a little fiddlier to get the clips in the right place - just a bit of experimentation is what is needed-great product