They may not help you. Get a clapton coil on there either the rba they give you or buy one at your shop. If you don't know what a clapton coil is (i didn't) the shop guy will or should.. protank 4 is awesome they just shouldn't give you only 1 good coil. But i guess 3 makes the deal seem pretty...
For all those having leaking issues with protank 4. I have no idea why but the 1.5 oem coil and .5 coil they give you in the package are complete rubbish. They don't even sell the 1.5. I suggest you use the Clapton rba (the bulky rebuildable one) it comes with or go and buy yourself a clapton...