Japan Has World's Lightest Android Tablet
Android Central

Japanese carrier NTT DoCoMo launched the NEC Medias Tab UL N08-D, which uses an innovative carbon fiber technology that makes the 7-inch device the world's lightest Android tablet. The Medias Tab weighs just 249 grams, compared to the 249-gram Google Nexus 7 and the 400-gram Amazon Kindle Fire HD. The Medias Tab's specs though are not the light-weight: 1.5 GHz dual-core processor, 7-inch 1280 x 800 LCD display, 8 megapixel Exmore R back-lit camera plus secondary 2 megapixel shooter, 3100 mAh battery, and Android 4.0 Ice Cream Sandwich.

What Else You Need To Know

  • Added software features 7.9 mm thick tablet include a web browser that lets you actively view two tabs at the same time, and an "HD haptics" vibration feedback mechanism that's applied to just about every on-screen element.
  • No pricing and availability outside Japan have been announced.

Other sources

Apparently the NEC Medias Tab UL pulls this off by using a kind of carbon fiber that's used in modern aircraft construction. - Simon Sage, Android Central  
Android Central
NTT DoCoMo launches lightest Android tablet ever  

Apparently the NEC Medias Tab UL pulls this off by using a kind of carbon fiber that's used in modern aircraft construction.

Other
The Medias Tab UL N08-D is the lightest Android tablet out there
World’s lightest Android tablet, built with carbon fiber, launches on Japanese carrier