Highly flexible aluminium oxide abrasive which is resin-over-resin bonded to a cotton cloth backing. You can't get any more flexible than this cloth-backed abrasive for hand sanding. It's extremely resistant to clogging, readily torn into strips for easy abrasion of round or curved surfaces and moulds well to whatever surface you are abrading - skirting, door mouldings, spindles and other trim on wood, metal, stone, plaster and painted surfaces. It has a long life as well, due to its excellent resistance to clogging and strong, flexible cotton cloth backing.