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Classification: MF3 long chip/without chip MF3 square chip/without chip MF3-C/without chip MF3-S/without chip separate square chip separate long chip MF3 square chip/without chip with screw print

There is no chip by default, and the chip generally uses the original old board.

MF3 long chip, MF3-C, MF3-S, these three use long chip, MF3 square chip uses square chip.