PT. Boelan Oetama Mandiri, a sandpaper distributor that sells flap sandpaper in various sizes. Flap disc sandpaper or known as stacking sandpaper is a type of sandpaper made of material from a kind of waterproof paper, cloth, and synthetic fiberglass. The flap disc sandpaper functions as a working tool to produce a smoother and more flat surface of the object / material, which is how to use it rubbed manually or with a machine. Flap disc sandpaper is suitable for cleaning rust on metal surfaces and finishing work in a fabrication process, durable in use and giving smooth results.