1.The insulin syringe consists of the barrel,the plunger ,the plunger cap,the piston,the needle hub,the needle tube,and the needle protective cap. 2.The plunger fits the inside barrel very well to allow for free and smooth movement. 3.Sufficient transparent barrel allows easy measurement of the volume contained in the syringe and detection of air bubble. 4.Used for the medical injection,the blood drawing and the vaccine inoculation 5.The graduated scale on the barrel is easy to read. Specification: