LaVie G type Z was the PC I used. I think that they are good to use but I prefer plastic casings (PC/ABS) as it is cheaper, can be recycled somewhat easily, and are not too different from the metal alloys. Metal technology is improving slowly, but at this stage, the best way to go is to choose the common, old, long-standing plastic casings for PCs. Texturing and design of plastic is not too bad nowadays and is definitely better than before. The CASIO CG20 AU is based on CG10 of America, which won the common Good Design Award in Japan. It is plastic throughout, but does not lack a finish that stands out from other graphic calculators. Be careful of the screen, which can get easily scratched. It isn’t a screen like that on the TI-84+; it is of a different design. As we know with calculators, plastic keys are easier to touch; the plastic casing does not need to be extremely durable (PC/ABS is not outstanding either) as shown by the PS plastic used on previous CASIO scientific calculators. For small objects, cases/pouches can be easily made with paper. That is what I plan to do with my CG20 AU as well. A protective sticker covering for the screen may also be required.