
The four 13.3-inch Ultrabook notebooks are Lenovo IdeaPad U300s, Acer Aspire S3, Toshiba Portege Z830 and ASUS UX21. In addition to ASUS UX21 (thickness 17mm) and 13.3 inch version of MacBook Air (thickness 17mm, weight 1.35Kg) flat, the other three notebooks are lighter than the Apple MBA, while their shells are also made of metal material, but the weight of the whole machine All are under 1.4 kg.
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