Our products manufacture in a GMP 100000 grade purified workshop. The Needle retractable safety syringe are made of medical grape high transparent PP and rubber Latex - free. The transparent barrel is more Convenient for nurses to observe when they draw up medicine. Latex-free rubber also suitable for even the most sensitive skin types. And this product's needle can be retractable after giving Injection, The needle will be lock in barrel and can 't be pushed out. The function' non - exposure of needle can get needle - stick injury, and the air tightness of our product will be better then other Manufacturer 's Because Haiou' s product, the retractable part is needle (not include the needle hub), with this design, Haiou 's product have better air tightness, with high quality, Better air tightness and safety function, Haiou 's needle retractable safety syringe offers major advantages over manufacturer.