A medical IV cannula is a small, flexible plastic tube inserted into a vein to deliver fluids or medications directly to a patient. Cannulas are very important in healthcare and widely used in hospitals and emergencies. They come in different gauges from 14G to 26G depending on their intended use. Each cannula has a wing for a positive grip and a transparent hub for good visibility. GSTC makes its cannulas from non-irritant, biocompatible materials.