Their website unless it is not updated is 99%+ at 30 Microns.The real question: is what are they claiming for media efficiency on the new M1s? Is it still 30 micron?
Napa Gold 99% at 30 Microns
MicroGard Select 99% at 25 Microns
Carquest Premium 99.5% at 20 Microns
STP Extended Life 99% 20 Microns
Those are all PG filters, safe to say it is within that 25-30 Micron range.