 The design philosophy and the motive remained the same during the second and third iteration of the design but the material was changed to aluminium due to better manufacturability and easiness of putting fine details.Later, a magnesium variant was also added to offer an even lighter option.Initially, the line up included 11-inch screen-size model and 13-inch screen-size model but the 11-inch version was dropped by the end of 2011 due to the low popularity in Korean market.