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This backing pad is concave. I really like the sander itself, so I just purchased the backing pad with a "hard" hardness rating. If the backing pad was flat, the sandpaper disks would last a lot longer. The backing pad that came with my Bosch 1295DVS random orbit sander is of "soft" hardness. It only sands using the outer ring of the sanding disc. I'll let you know how this works out. I'm refinishing the oak treads on a set of steps and can only sand about 4 treads before I have to replace the sandpaper disc.
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