qqwref
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All cubes will lock up if you turn them inaccurately. However, type F (haven't tried F-II but it's probably the same deal) has cubies that are more curved than normal, which means it can kind of cut corners at a slight negative angle. This means that it is more resistant to inaccurate turns than other cubes, and will lock up less (assuming tightness, lubing, etc. are constant).