The syringe is consisted of the barrel, the plunger, the gasket, the graduation line, the needle hub, the needle tube and the needle protective cap. 30Unit or 100Unit for selection. The Barrel is transparent enough to allow easy measurement of the volume contained in the syringe and detection of air bubble. The plunger fits the inside of barrel very well, promising permitting freedom of movement. Graduation printed by indelible ink on the barrel is easy to read.