Couldn't find much on these shafts. I'm thinking it was a thin walled .246 full diameter shaft. The Matrix, along with the Easton Bowhunter lineup would be very similar. There are definitely better standard diameter shafts out there if that is what you are wanting to run. Sirius makes a far superior shaft, as well as Gold Tip. The Bowhunter line is simply the Beeman ICS Hunters brought back to life. Your getting an extremely thin walled fragile shaft. The Easton Axis would be a far better option than all the ones mentioned above.