Yes, these are T4s...and that is a good price. They should be identical to the Halo mini...but Halos are $3.99...well done SI.
Also, if you use them on an X2, the cone fits but VERY snuggly. I used some metal sand paper and sanded down the narrow end just a bit (someone else reported using a dremel tool) and now it slides on nicely. An X2, with this mini clearo and a cone makes a great pocket friendly out and about device. I've been using these for about a month, and they are a very simple, very nice little product. Even tho the mouthpiece is just a push on, I've never had any come off accidentally. They rinse out easily, and they are very easy to fill.
Maybe I went on too long...but I'm really happy that SI has added this to the lineup.