The BD Micro-Fine pen needles can be used to administer insulin using an insulin pen. The pen needle with Thinwall technology has a large diameter and allows good insulin flow. The three-dimensional ground tip and patented lubricant ensure minimal resistance. The pen needle is virtually inflexible and can be used on all common insulin pins. These pins have a size of 0.25x5mm (31G). The BD Micro-Fine pen needles are available in different sizes. Packaging of a total of 100 pen needles. Each needle is packed sterile.