The inerasable graduation permits a easy reading, 40 Unites or 100 Unites is available. The plunger fits the inside of barrel very well to allow for free and smooth movement The needle cannula is glued with the syringe tip, no dead space.and covered wth cap to prevent bending . The caps for plunger and needle are easy to remove,and the color of the cap is distinguished between U-40 and U-100 Sufficiently transparent barrel allows easy measurement of the volume contained in the syringe and detection of air bubble. Extra wide finger grips is convenient for holding. Sterilized by EO gas, non-toxic, non-pyrogenic, single use only. Available size:1cc,1/2cc ,3/10cc The size 27G to 31G are optional for needle. Shelf time : five years