as a professional radio pens, radio writing pens, light pens manufacturer, exporter, supplier and factory in china.--haitian international industrial co., ltd. is a powerful synthetical enterprise. the stationery department is the largest department, owning 3 pen-made factories. haitian chengong metal pen co,. ltd produces light up pens, metal pens, radio pen, radio writing pen, light pen and semi-metal pens.