THESE CASES HOLD TWO AMERICAN DJ PRO SCRATCH 1 PLAYERS AND ONE MIXER.RECESSED HARDWARE. THE 1R HOLDS ONE PRO SCRATCH PLAYER. THE M10 HOLDS A 10" MIXER. THE M19 HOLDS A 19" RACK MOUNT MIXER. THE M56 HOLDS A PIONEER 500 OR 600 MIXER. THE QMX HOLDS A Q-MX2 MIXER.