Unless advertised as OFC (Oxygen Free Copper) wire, there is a big chance that the cheap wire you're buying is CCA (Copper Clad Aluminum) wire.
What's the difference?
CCA wire is made up of aluminum strands that are coated in copper, making them roughly 40% less efficient than pure OFC wire. What this means is you could buy 1 wire gauge size smaller of OFC and end up with the same conductivity as the CCA wire. 18AWG OFC could equal or surpass 16AWG CCA, and in most cases, it does.
OFC is a great conductor but it does have its limitations. Once exposed to the elements, copper tends to oxidize and turn green or black, thus compromising its ability to conduct electricity. (This is why the copper clad Statue of Liberty is green).
We've taken copper a step further by coating the strands in tin. This coating protects the copper from the elements, ensuring great conductivity over many many years.
Bottom line? When it comes to wires, bigger isn't always better.
2 sizes, 5 colors available:
16AWG PhP630/ roll of 30 meters (PhP21/ meter)
Also sold by the meter (5 meters minimum) (PhP27/ meter)
18AWG PhP430/ roll of 30 meters (PhP14.33/ meter)
Also sold by the meter (5 meters minimum) (PhP18/ meter)
Jacket: Ultra flexible PVC
Maximum voltage: 300V
AWG 18 strand count: 53/0.12
AWG 16 strand count: 90/0.12