If you take a look at the coil, at the base, it should give you some information about what kind of material that coil was made with. Without knowing more, we can't help...
Ordered 100 more Kanger Subtank OCC 1.2 Ohm horizontal coils on 7/21 ($68 after 20%-off coupon/promo discount), and received a notice from Fasttech today... they just now shipped! So, I should have them sometime between Labor Day and Christmas :P Good thing I'm not in desperate need, huh?