SteelSeries 4D - double density. A mouse pad made of a special durable plastic compound. The pad features two different surfaces - one for roughness and one for smoothness. The two different surfaces make the pad ideal for both low and high sensitivity gamers. The pad is compatible with all mice - including ball, laser and optical mice. For steady placement on the table it comes with a special non-slip rubber base that can also easily be placed individually from the pad.