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re: 4355 Z3X2 - design team name for case.
4355 - weight is 4.55 oz
Z3X2 - is a little more interesting, Z3X is an unlocking tool for SAMSUNG phones, and this is the first phone with no SAMSUNG chips in it i.e. Apple is unlocked from Sammy!
re: SYX2 - get it? the industrial design team name for the case is SYX 2 i.e. the 6.2 inches in length of the case.