WW-8 from Weiler is a 8" diameter crimped round filament Nylox Wheel featuring a composite hub.   The face width is 1" with a 2" arbor.  The silicon carbide filament size is .040 in and 80 grit. 

Filament trim length is 2-1/4"

The MOS for the WW-8 is 4,000 RPM.