Includes one each of the following blunt needles: | NF33BL-2 | 33 gauge, 210 micron tip O.D | | NF34BL-2 | 34 gauge, 185 micron tip O.D. | | NF35BL-2 | 35 gauge, 135 micron tip O.D. | | NF36BL-2 | 36 gauge, 110 micron tip O.D. | A NanoFil Syringe is required to use these needles for injection. |