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Model no.: M4IN1-1, M4IN1-M111, M4IN1-M113, M4IN1-M110Hold the pen backward about 30 degrees inclined, with a wish color markor the "0.5" mark facing to you, then press the top button for refilling.Inner packing:1pc/OPP bag, 50pcs/inner boxOuter packing:500pcs/ctn
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