Made in Aluminium oxide and mainly used in hand-held power tools.
Flap wheel tools is mix of non-woven flap wheels (scotch-brite) and standard emery cloths, radially located around the hub of the tool.
It is necessary to define both: the grit of the interleaved cloth and the grit of the scotch-brite as follow:
A/M = 100 / 120
A/F = 180 / 220
A/VF = 280 / 320