manufacturer‘s environmental protection invisible pen core， invisible pen， can pass the test， lead content within 40ppm_牛牛贸易

manufacturer‘s environmental protection invisible pen core， invisible pen， can pass the test， lead content within 40ppm

manufacturer‘s environmental protection invisible pen core， invisible pen， can pass the test， lead content within 40ppm

厂家环保隐形笔芯，隐形笔，可通过检测，铅含量40PPM内

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