These foam pads have cloth backing for PSA sandpaper or sanding adhesive and has a 5/8-11 female thread.
Firmness:
* Xtra Hard – Purple (MAX RPM 5000)
* Hard – Orange (MAX RPM 5000)
* Medium – Red (MAX RPM 2800)
* Soft – Yellow (MAX RPM 1750)
* Softie – Blue (MAX RPM 750
