User blog comment:Gundam Legilis/Volume 1 Weapons In Depth- Penny's Swords/@comment-50.175.158.72-20140723013235/@comment-3257939-20140723024006

The strings are... strings. You can hardly see them.

But you're right. Those kind of moves can be done with strings alone, there has to be something else. Like how she tour them like a mill. I believe the strings are to pull things and she uses something else to move the blades.