Our U40 pet Insulin syringes are designed to be ultra-thin and less traumatic for dogs, cats and other pets. The syringes come with a super-thin 30G and short 5/16" (8mm) needle and are ideal for a safe and comfortable injection. They are made to the highest standards with surgical-grade steel and non-toxic, non-pyrogenic plastic by an FDA-registered manufacturer. Each 1/2cc syringe is graduated for use with U-40 insulin and can contain a maximum of 20 units of u40 insulin.