Carbon reinforcement for the battens of any hang glider, both 10
mm and 12 mm. The reinforcement guarantees better performance, strengthens the
battens with only a few extra grams. For information:
<darkblade55> cell.+39
3488230794 (whatsapp).

Ian Duncan writes and Steve Pearson agrees:

The big problem with this is that the carbon sock is all off axis
fibers and therefore does very little work for weight added. You would be far
better adding well bonded unidirectional fibers. If you are going to use 'sock'
then using a far larger diameter sock compared to the diameter of the batten and
stretching it lengthways would be preferable as this would pull the fibers
closer towards the 0 axis of the batten.