Key Information: ‣ Size: 4mm ‣ Uses: BD Microfine Plus Pen Needles ensure precise and comfortable insulin injection for patients using insulin pens ‣ Directions: Attach the needle to the insulin pen, inject the prescribed insulin, and dispose of the needle after use ‣ Warnings & Precautions: For single use only. Dispose of needles properly in a sharps container. Keep out of reach of children