Key Information: ‣ Size: 4mm ‣ Uses: BD Micro-Fine Pen Needles provide precise and comfortable insulin delivery when used with compatible insulin pens ‣ Directions: Attach the needle to the pen, inject the insulin as directed, and dispose of the needle after use ‣ Warnings & Precautions: For single use only. Dispose of needles safely in a sharps container. Keep out of reach of children