these have external ego threading, I used one as a 510 extension, making use of the female 510's air grooves for my cartomizer. Had six, not five, in the bag unopened, probably a miscount...threading is good enough, definitely not high grade metal here, but should do the trick for the price...many potential uses, get creative! Have hole all the way through, could be used for air activated mods and potentially squonking (my next project)...thanks to FT for stocking this old stuff...

Nice job by "new" manufacturer 5AVape. Everything seems spot-on, a perfect reproduction. Everything fits, seamless and snug. O-ring tolerance is perfect...nice and snappy, cap "pops" into place, and is very satisfying. Dual air inlets on each side allow a good restricted vape fully open, and will please MTL types when shut down incrementally. ..The coiling area and larger screws beg for a larger coil, and my first build is loud and proud at .16 on a mosfet squonk, and this thing can handle it, no problem. Fully open, the Aston has enough air to keep my cap cool, though I'm no "chain vaper". The vape is very similar to another recent RDA, the Haku Duet. Both hold big coils and have similar air flow, and have diminutive stature. The Aston wins in simplicity, with a tried and true design that offer trouble free, long-time use. 5AVape did everything right here, and the price is quite fair for the level of quality on display...again, the finish and laser work is perfect. Nice Job on a great squonk atty.

Oh my gawd, the thick, wet, saturated Coconut Macaroon is unbelievable in this!!! Yes, I'm that weird guy that only vapes one juice in my Billet bridges and RTAs, but the good thing is my senses are highly tuned to that one fantastic juice, and it really kicks in this Link'D---WHEN i finally got to actually VAPE the juice. instead of just wiping it off my coffee table. There is a tool included, so use it! Make sure those two joints (the pin receiver on the bottom, the chimney) are securely tightened, and use the fantastic JFC to check for leaks in the tank seals BEFORE releasing the juice to the deck. A great feature that works well, and IS a bit of a game-changer for future bridge systems. My first fill plug tore in half easily, but there are 3 others in the package, with the 2 red ones feeling stronger than the clear ones. The biggest flaw is the connection/air pin system. Connection can be finnicky, but most Billet users know how to change their pin length slightly to make contact....Out of the 5 pins, the larger airflow ones seem to be harder to connect ---- no doubt due to the lack of actual metal surface area to make contact. I have not been able to connect on SupBox yet, despite 4 or 5 tries... This is a challenging kit, no doubt, and the first one to really kick my ass in years...tough to master, but rewarding. A good looking and great vaping piece of kit, if you're up to the challenge!

The biggest deal around on a generally poorly received mod from SX Mini. This mess never had a chance at 200.00, like it's sibling, the G-Class. While the G has style and some restraint, this T class goes all out to convince users that it's "cool" and "modern"...and it fails, miserably. The chip is saving grace, it's great, though some convoluted controls lessen the experience...the joystick is overall better and easier to manipulate than the G Class and SL class mods. They put the chip in a monolith of a mod, so at least the Yihi innards are protected well. Type C works well and is a nice addition. The battery door is typical high quality and secure. The design holds this mod back -- but at sub 40.00, it's ALMOST a mandatory purchase for those looking to get their feet wet in the quality mod arena...good purchase!

the three negatives listed above are all valid and should be taken into consideration...this is not an rta for those wanting long uninterrupted vape time. Wicking must be thinned and allowed to "breathe" when poked into the smallish wick holes and out the bottom, almost rdta style. Full on DL users will need to alter their style, as this is restricted, even wide open. The airflow is genius, though future iterations could benefit by a "marking" system, to let users know where their preferred airflow ring orientation was. The under coil airflow is 61 tiny holes, amazing how precise this rta has been built and designed. Packaging is nice, with coils and cotton, atty stand and sunglass bag/ wiping cloth. This RTA is any easy build, medium difficulty wicking and medium to high performance/ flavor atty. Many will love the industrial look, many will love the machining, and many will love the vape it gives....overall, not a bad purchase at all --THC makes quality products, and this one is a winner.