The FS-3750 uses TK-20H black toner, while MK-24 is a maintenance kit for the printer. They are different purchase types, even though both belong to the same model.
Toner Buzz carries genuine Kyocera TK-20H toner and the MK-24 kit. Choose the toner for normal supply needs, and select the maintenance kit only when the printer's service requirement points to MK-24.
Guaranteed fit for Kyocera FS-3750
The products below are genuine OEM Kyocera Supplies made for the Kyocera FS-3750.