screening

Hi,

Got myself a screened cable with 2 wires to be used for the step-
direction signal cables. I noticed that the USB cable screen is
an "aluminised?" sheet in contact with an exposed earth wire.

The "screened" cable I have, the "screen" is a "network" of fine
copper strands, no "aluminised" sheet. Will this be as effective as a
screen for signal cable?

Thanks

Alex