Advocate Insulin Syringes 31 Gauge .5cc Box of 100 SyringesPetTest Insulin Syringes are designed to be used safely for U 40 pet insulin injections. Manufactured using high quality surgical grade steel, our syringes are easy to use, safer to handle, and provide greater comfort for your pet due to the thin, fine, and sharp extra lubricated needle. Features: Thin, Fine, Sharp, Extra Lubricated Needle Features half unit markings for more accurate dosing Tri Bevel Tip for Greater Comfort Large Clear Unit Markings