This is the Norton Ultra Blue Stripper Pad.
Sold by the case (5 pads in a case).
SIZES; 21" to 28" (3-1/4" removable center).
For use on the most severe floors. This pad has extra heavy duty fibers, more abrasive grain and an open weave designed to strip floors quikly & effectively, reducing labor costs.
These pads are dipped not sprayed which makes for a longer lasting pad.
The 22" to 28" pads are a non stock item so allow an extra 3-5 days for delivery.