I suspect, with no direct proof, that rather than dressing sticks, these are abrasives as used in the wheels, but in stick form for hand use.
46 GF106H might be 46 grit GF106 bond to match the wheel, rather than to dress it, not sure about the H
Manhattan Grinding Wheels
Maybe similar to a more precise version of Garryflex blocks
For cleaning/dressing rubber bond diamond wheels, I use the very soft white sticks from Axminster, as opposed to hard Devil or Norbide sticks.
https://www.axminstertools.com/cleaning-stone-for-cbn-wheels-diamond-stone-400g-104143
Bill