Insulin Syringe for Vetsulin Injection Comfort Latex Free Clear Bold Markings Sterile insulin syringe with attached Ulti-Fine 29 gauge needle for use with U-40 insulin products. Recommended to use with Vetsulin insulin (U-40) and for 20 units or less insulin dosage. UltiCare U-40 syringes are designed to provide the proper dose of U-40 insulin. This means that measurements of one u...