I went to the local BM & bought a couple of Kanger .15 ohm TC coils for my Toptank Mini. I thought they looked different. When I went to swap one out I noticed they're about 2/3 of the diameter of the one I had in. The one I had in had had two big holes and one small one in the side. The new one doesn't have a small hole and the big holes aren't quite as big as they were on the old one. The band is blue around the bottom. It fits anyway. Probably the tank would hold more juice too with the smaller size. It works pretty much the same as the old one except the resistance is a bit higher than on the old ones. The old ones were reading about .22 and this one is reading at about .26 ohm. Anybody else seen these? What's up with these? They say .15ohm 15W-50W on the side.