H&M ABRASIVES-USA Jumbo Flap Discs are manufactured in accordance with ANSI safety requirement and ISO 9001 standard. They are made with VSM abrasive cloth which is the top quality in the world and premium zirconium aluminum oxide grain for fast stock removal. Compare with standard Flap Discs, the thinker disc provides the same high performance but with 50% more usable abrasives, 40% longer life, outperforming 2 to 1. Idea discs use on ferrous non ferrous metal and in application where a large number of flap discs are usually used.