Review on Quality Flap Disc Pack - DocaDisc's 4.5 inch (10 Pack) - 40 Grit Zirconia Abrasive Grinding Wheel, Flap Wheel, and Sanding Discs - Professional Grade by Raymond Iglesias

These flap washers work but are quite flimsy. They don't last very long. I had a small project using an angle grinder to scrape rust off metal gates and they got the job done, but I had to replace them often. Diablo lasts 2-3 times longer but I can get a 10 pack for the price of one. For the price I paid for it I will buy again. Also note that the paper on the disc will fly out when you use it, which is a bit dangerous. Therefore, be sure to wear safety goggles.