The Book 9 2015 Edition is a premium Notebook PC providing an ultra-slim thickness of 11.8 mm, weighing only 950 g, which provides high portability. Also the 12.2” compact size takes up only 77% of the external size of 13”, but its 4:3 screen proportion secures a vertical screen length similar to that of 13” providing a great screen efficiency when working on documents and using the internet. The exterior has a full-fledged aluminum metal body emphasizing luxurious feel with the silver character line detail on the side. The keyboard usability was improved by making the keyboard surface concave where the fingers touch with the curved surface.