Please see my other review Replacement Coil Head for Nautilus Mini Clearomizer (5-Pack) Mini, Coil Head, 1.6ohm, 5-Pack / SKU: 5834800 - same issue. I think these must be the same company. If you have any solutios let me know, but I'm done with the knock-off coils. thanks

not worth the risk, took 3 months for the order to arrived then when it finally got here one coil after the other just leaked. I tried several tanks and every coil I opened from a new pack leaked. I matched them up to an authentic aspire coil and these are just a tad taller and a tad more narrow. That's just my guess as to why they are leaking. I hope fast tech will investigate. If you have any other ideas or solutions PLEASE let me know cause it seems like such a waste to toss them, not to mention all the juice wasted and time waiting. Bottom line, not worth saving a few dollars buying these coils. Also the time it would take to return them, you'll end up paying more for the shipping than the product. Beware, stick to the authentic, if there's a problem at least your local vape shop should be able to return them. Though I never had a problem with authentic Aspire coil. Very bummed.