This kit is essentially a soft pad conversion kit. It includes a new interface pad that that will let you fit two specialty soft sanding pads on the head and still kit the sanding head at the correct height for maximum dust control. This set up is ideal for users that want a softer pad, similar to the 7800 sander, rather than the standard rigid pad. Perfect for more delicate curves and contours when you want to take less material off the wall. Move over high spots a bit easier. Includes three pads total.