Most netbooks were plastic creakers. The Vaio PCG-3J1M utilized an exclusive layered with a brushed aluminum palm rest. The "exclusive" nature here is the weight . Thanks to the Z540’s fanless design and a custom, ultra-dense Lithium Polymer battery (shaped to fit the curve of the hinge), the unit weighed just 1.19 kg (2.62 lbs) .
First, let's clear up the confusion. Sony used a dual-identity system. sony vaio pcg3j1m specs exclusive