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Precision Plastic Spheres & Roll?On Applicator Solutions Shantou Chengrui delivers fully integrated plastic sphere solutions, from CNC?machined preforms and controlled blow/injection molding to multi?stage CR?PBM grinding. Our hollow spheres (6–80?mm), roll?on balls (3–6?mm) and blanks meet ±0.02?mm tolerances, Ra ??0.35?µm finishes, and are engineered for seamless assembly in valves, applicators, insulation panels, and diagnostic devices.