This is the Norton HIGH PRODUCTIVITY BLACK STRIP pad.
Sold by the case (5 padss in a case).
SIZES; 21" to 28" (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.
These pads are dipped not sprayed which makes for a longer lasting pad.
The 22" to 28" are a non stock item so allow an extra 3-5 days for delivery.