I have been looking hard at those shafts my self.I believe the might be those old AFC shafts,atleast going by the way they size them,(2200,2300,2400)and the weights per inch.
With this whole,"skinny shafts penatrate better",,people are starting to take a second look at the "old" poultruded shafts.I remember useing the Beman Hunters years ago.Talk about concentrateing your KE to itty bitty surface[:-],,My doc made me give them up.He said,"if you keep shooting those things into Mckenzies,your going to need a shoulder replacement",,