An IV cannula is a thin flexible plastic tube used by doctors to administer fluids or medications directly into a patient’s vein. Cannulas play a vital role in healthcare and are commonly used in hospitals and emergencies. They come in different gauges from 14G to 26G depending on the Designed for use. Each cannula has a wing for a firm grip and a see-through hub for clear visibility. GSTC manufactures its cannulas from biocompatible non-irritant materials.