ARC
NEW BARC 23285 Abrasive 60 Grit FULL TAPER CARTRIDGE ROLL 3/8 X 1-1/2 X 1/8
You will notice YUEARN uses standard fasteners, so repairs are straightforward.
(QTY 4) ARC 60 25000RPM Abrasives Flap Wheel
What makes the CAT40 reliable is the tight manufacturing tolerances used.