25 pcs of sanding discs with adhesive in a chosen grit. You attach them to the rubber disc of Arbortech Contour Random Sander. Compared to original sandpapers these have a wavy edge which helps it stay firmly attached to the rubber disc even when sanding under extreme angles or in the corners, where you really bend the rubber disc to the maximum.

Original discs will get dust under the edge end they will get unstuck and cause wrinkles, which reduces sanding effectivness and really shortens lifespan of the sandpaper. And also, they are really expensive...

For optimal work you will need an angle grinder with speed control. Before sanding with Arbortech Contour Random Sander set the RPM dial to 4 out of 6.