guys,  I am trying to connect PCIE with extender cable, after peel off the shield plastic, I realize the copper wire isn't too thick, is it normal? how do I know if the cable is not suitable to use if it's too thin? I can't take a photo as cable is too small for my phone camera to take a clear picture, please advise.

Power supply direct output cable marking: 18AWG

Extender marking: 22AWG


is it ok to use this extender cable?