BD's classic design for injection comfort, the BD Micro-Fine™ IV Needle is a 28-gauge, 12.7mm (1/2") syringe needle that has been trusted for years by people with diabetes. BD Micro-Fine™ IV insulin syringes are available in three barrel sizes (1cc, ½ cc and 3/10 cc). They come in boxes of 100, and are packaged in polybags of 10 for your convenience.