"PRO X" considered performance enhancement by customization of key switch and answered to an exchange to correspondence key switch of separate sale. A key switch kit is GX KURI of "GX linear" of the red axis type of "GX Taku tile" and the smoother typing of the brown axis type which can have certain dakenkan and push it down correctly and the blue spindle-type by which pleasant click noise resounds through an ear ".

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