Our 4 Inch Diamond Polishing pad thickness is 3.2 mm.

They are NOT the 2.8 or 3mm cheaper type  (most of the seller are selling 2.8 or 3mm cheaper type pad).

The pricing $ 31.99 or $ 29.99 is for 12 Pieces.  Please choose the grit you need.

Pad can be wet or dry use (wet use recommended).

Ideal speed of grinder or polisher is between 2800 and 5000 RPM.   DO NOT use high speed grinder or polisher (6000 7500 11000 RPM grinder is NOT appropriate).