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The production of ballpoint pen tips has high requirements on the precision of processing and the selection of materials. There are not only small "balls" on the pen tip, but also five grooves to guide the ink, and the machining accuracy must reach the order of one thousandth of a millimeter.
Firstly canvas is a type of cloth that is used for painting by applying a coating base that prevents penetration of oils, solvents, water, etc. on a specific cloth substrate.
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