No they are not axis sized FMJ, easton now sell arrows according to internal size diameter in metric international system
4 mm (0.166" micro diameter shaft like Victory VAP) 5mm ( 0.204" HIT insert axis size arrow) 6mm ( 0.235" hp same size of beman center shot shafts size ) and 6.5mm ( 0.246" standard 5/16 shaft)
Those 6mm fm just are carbon alloy shaft in the same diameter than aftermath shafts or beman centershot. Most probably a cheap ACC shaft but with the alloy outside.
Felix i found that an axis carbon shaft with HIT insert and footed with gold tip ballistic collar is extremely tough and cost effective and MUCH tougher than fmj axis as collar is overlapping over the carbon and shaft will not bend and loose the straitness over time like fmj
Size large for collar is perfect for .300 and .260 spine and axis traditional .340
