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An insulin syringe has three parts: a needle, a barrel, and a plunger. The needle is short and thin and covered with a fine layer of silicone to allow it to pass through the skin easily and reduce pain. A cap covers and protects the needle before it is used.
INSULIN SYRINGE
The needle gauge defines the needle thickness, while the barrel size controls how much insulin a syringe can hold. Some people may find it easier to inject with thinner needles. The length of a needle controls how far it may go into your flesh. Insulin needles must only go just beneath the skin, not into muscle. Shorter needles are less likely to enter the muscle.
