The Crossover is an epoch-making structure newly developed for casing-up by D.Factory. It is surprising that the separated-two-pieces of cases are jointed and united in a symmetrical way. This completely unheard-of structure, so-called "The Crossover", can be definitely visible by differentiation of material and finishing in its respective cases. The unbalance from 'The Crossover' can make you esthetically perfect.