The wire is composed of 4369 strands of enamelled copper wire, the single wire diameter is 0.05 mm, and the litz wire is covered with PI film, also known as polyester imide film, which is the best insulating material in the world at present.
This taped litz wire can also be called profiled Litz wire, because it is a square wire with an overall size of 4.1mm*3.9mm.