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Sony's 13" PDF reader with the Moebius screen was extremely light (350g) for its size because the case was thin and floppy. It did not have to be strong enough to keep the screen from bending. The same is true of the Onyx Max products. My old PB902 with a 10" glass substrate screen weighs 530g, mostly because the case is made of rigid steel to keep it from flexing and breaking the substrate. A 13" ereader with a glass substrate would weigh at least twice as much as my old 902. That is why all 13" ereaders are built with Moebius screens now, so that the weight of the case can be kept to a minimum.
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