Key Components
Needle: A short, fine stainless steel needle with a beveled tip.
Wings: Two soft plastic wings that resemble a butterfly, allowing for easy handling and skin stabilization.
Tubing: A clear, flexible tube connecting the needle to the connector.
Connector: A Luer lock fitting that attaches to syringes, vacuum tubes, or IV lines.
Safety Device: Many modern sets have a safety mechanism to prevent needle-stick injuries. 
Uses
Phlebotomy: Drawing blood samples.
IV Therapy: Administering medications, fluids, or blood transfusions.
Special Populations: Ideal for pediatric (infants/children) and neonatal patients, or adults with difficult-to-access veins (e.g., in hands/wrists). 
Advantages
Patient Comfort: Minimal tissue damage due to the fine needle.
Versatility: Can be used for both infusions and blood collection.
Accuracy: Reduces blood cell breakage, improving diagnostic results.
Safety: Integrated safety features reduce infection risks.