Duplicated strands and flip over world center axis.
Mirroring over X axis
Flip
Flips strands over world center axis.
Flipping over X axis
For Cards - mirrored/flipped strands will have their UV adjusted based on the "Mirror/Flip UV Method" setting in the scene presets menu. Mirror/Flip UV Method (Card Only)
As the strand is vertical laid out, the "MIrror/Flip UV Method" is set to "Flip UV in U" for best performance.