The Zenfone series is Asus whole new android smartphone coming with 4,5,6 inch. People always want a smartphone that is powerful with great functions and comfortable to hold. This kind of request is a contradiction, however it is a rational user behavior. Therefore, our team come up with the idea to design the placement with a pyramid structure. This structure is beneficial for design an elegant curving back to create a comfortable holding feeling. Besides, we apply special ceramic painting technology that increase the holding feeling with a delicate silk touch.