BD Micro-Fine Plus 31G x 5mm is a high-quality insulin pen needle designed for comfortable and precise insulin delivery. These sterile needles feature ultra-thin walls and special coating for smoother injection experience. The needle dimensions are 31G (0.25mm) diameter and 5mm length. Compatible with all major insulin pen brands. Comes in a box of 100 sterile, single-use needles. For subcutaneous injection use only. Each needle is individually sealed to maintain sterility. Should be disposed of after single use in appropriate sharps container.