This is an excellent sandpaper for turning wood. I don't know if this abrasive is crumbly or not, but it doesn't break like "old fashioned". The underlay also adheres well when sanded with mineral oil and beeswax.
Pros
Combine this premium sandpaper with a sanding block, sanding board or use hand sandpaper to work on hard and soft carbon steels, soft metals, titanium, super alloys, hard and soft wood, fiberglass and composites and to work on