Dark stone headphone cable is a 4 core headphone cable sleeved in two colour shifting nylon sleeves  from amp end to headphone end and can be modified with anything from wire type, length and connector colour. See below for wire choices.
(the 4 strand braid is available in the archive cable section)
 
Main body 6mm
Headphone ends 4mm
Wire type- ofc, occ copper litz, occ silver plated copper litz or pure silver
Headphone type- Any full size double sided entry
Flexibility- 10/10 
Colour- Purple/ black
Connector colour- Any