Topband: L-network coil size

[Steve Flood]

I am designing an L-network for my 160 vertical which I would also like to put on 80 and 40m.
I have figured out the component values for the 3 bands but would like to know how large the coils need to be.
I am using series coils with a predicted 5.5 Amps maximum RF current at full legal limit.
Can I just simply use #12 wire? how about 1/4" copper tubing? or something in-between?

Thanks,
Steve KK7UV