NEW THINNER NEEDLE! The 31-gauge, 8mm (5/16") BD Ultra-Fine™ II Short Needle is 37 percent shorter than a 12.7mm needle. You should consult with your health care professional before using the BD Ultra-Fine™ II Short Needle, and carefully monitor your blood glucose when changing to a shorter needle. BD Ultra-Fine™ II 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.