This is the Norton HIGH PRODUCTIVITY BLACK STRIP pad.
Sold by the case (5 pads in a case).
SIZES; 31" & 32" (3-1/4" removable center).
For floors with an extreme wax buildup, this pad will cut away old finish quikly with its tough, porus construction.
The 31" & 32" pads are a non stock item so alloe an extra 3-5 days for delivery.