Key Information: ‣ Size: 4mm ‣ Uses: Designed for use with insulin pens, providing accurate and comfortable insulin injections. The ultra-thin needle ensures minimal discomfort. ‣ Directions: Attach the needle to the insulin pen, inject the prescribed dose, and dispose of the needle after use. ‣ Warnings & Precautions: Single-use only. Properly dispose of used needles in a sharps container.