Cerberus is a large sanding board from DSPIAE. Made from anodized aluminum alloy, it is available in 3 colors and offers two sides to receive 25mm wide adhesive sandpaper. The slotted side allows the sandpaper to “ripple” and thus become more aggressive. The flat side is used as a normal sanding block. Alternatively, you could use different grits on either side. Either way… This Cerberus only has 2 heads.