Reddit reviews Winsor & Newton Bleedproof Marker Paper Pad, 9" x 12"

It's just a brand marriage, you'll find that this black & cyan W&N bleedproof marker pad is just Letraset bleedproof with a new cover. The "Promarker" markers are just Letraset markers with a new logo.

You can still find the Letraset branded pads in some art supply stores though. I suspect they had one helluva salesman pushing boxes of the stuff onto local supply stores, because like the orange & yellow pads, I still stumble over them when shopping.