BD 30 gauge x 1/2?Insulin Syringes with Ultra-Fine Needle 1 mL, 100 Count BD 30 gauge x 1/2? Insulin Syringes with Ultra-Fine Needle 1 mL are designed for administering insulin injections. The syringe has a barrel size of 1 mL and an ultra-fine needle size of 30 gauge and 1/2 inch in length. This particular size is commonly used by people wi