Product Overview: Mirka 3" Diameter x 0.39" Thick Solid Foam Interface Pad (1033) is used in combination with grip sanding discs for sanding rounded surfaces and contours. Using an interface pad will produce a softer sanding result and minimizes over-sanding on curved surfaces. The interface pad is simply placed between the backing pad and the sanding disc. Perfect for use with Mirka 3" machines such as the DEROS 350X electric sander and MR-3/MR-350/MR-350CV/MR-3SGV pneumatic air sanders and other brand tools of same size. Sold 1 pad and 5 pads per package. Features and Benefits: 3" (75mm) diameter x 0.39" (9.9mm) thick size Use in combination with hook & loop sanding discs for sanding rounded surfaces and contours Produces a softer sanding result minimizing over-sanding Perfect for use with Mirka 3" machines such as the DEROS 350X electric sander and MR-3/MR-350/MR-350CV/MR-3SGV pneumatic air sanders