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13.56MHz HF MF Classic 4K S70 RFID Card with Hico Magnetic Strip About 13.56MHz 4K RFID cards :There are Original and compatible 4K cards , Original 4K chip made in MF , compatible 4K chip made in China ; Original 4K is more trustworthy ,compatible 4K is more economic .Basic Feature : MF4K S70 RFID PVC cards with Hico magnetic strip ;CR 80 Size (same with credit cards ) :85.5*54*0.84 mm ;Good qua..