Asus has announced five new Zenbook line of ultrabooks, including the UX21 and UX31 series. The Asus UX21 series includes the UX21E-DH52 and UX21E-DH71, while the Asus UX31 series includes the UX31E-DH52, UX31E-DH53, and UX31E-DH72.

The Asus UX21 comes in 11.6-inch display with a resolution of 1366 x 768 pixel and up to 5 hours of battery life, while the Asus UX31 is packs a 13.3-inch display with 1600 x 900 resolution and up to 7 hours of run time.

All Zenbooks feature an aluminum alloy casing up to 0.67-inch thick, the Super Hybrid Engine II power management technology, the USB Charger+, a V-shaped channel (a custom cooling technology), and a unique copper fin design for improved airflow.

Other hardware includes a 4GB of RAM, a Bang and Olufsun audio system, a SATA 6.0 Gbps SSD, stereo speakers with Bang & Olufsen ICEpower technology, Bluetooth 4.0, 802.11 b/g/n WiFi, micro HDMI and mini VGA out, and USB 3.0.

Price of Asus UX21E-DH52 starts at $999 and packs a Core i5-2467M CPU, 4GB DDR3 RAM and a 128GB SSD. The Asus UX31E-DH72 has a Core i7-2677M processor, 4GB of RAM, a 256GB SSD, and price of $1,449.

Gallery: Asus UX21 and UX31 Zenbooks