The Aspire BDC ET-S Clearomizer is definitely one of the best performing clearomizers we've ever had the pleasure stocking here at Texas Select Vapor. With replaceable dual bottom coils, the performance on these little clearomizers is amazing. With a small form factor similar to CE4 style clearomizers, the Aspire BDC ET-S looks great and performs even better. Another great feature with these clearomizers is the fact that the drip tip is a standard style tip rather than those pesky threaded tips. When filling the tank, you fill it from the bottom rather than the top.