Sterile lancet needles suitable for all blood glucose monitors. The sterile needle lancets offer a gentle way of sampling blood. You can choose the position of the blood collection pen according to the roughness of your finger.1-5 file depth can be adjusted. The blood collection pen uses environmentally friendly materials to ensure your health and safety. Minimally invasive technology: When you use a blood collection pen, you will hardly feel pain and reduce your psychological burden.