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Prefillable system or prefilled syringe is getting more and more popularity in pharmaceutical industry. A prefilled syringe is more convenient to use for caregivers since it involves fewer administration preparation steps as compared with glass vial. It also avoids the problem of over-fill volume, which is a phenomenon usually seen with glass vials. Precise therapeutic dose can be achieve by use prefilled syringe since the required drug volume can be filled during syringe filling. Other factors such as increasing demand for auto-injectors are also driving the growth of prefilled syringe. As the experienced supplier of plungers and needle shields for prefilled syringes, we devote ourselves to the continuous improvement of these components. The researches on the breakloose, glide force, elastomeric formulation, container closure integrity and drug compatibility are important for the quality and functionality of plungers and needle shields.