For use with insulin pen injector devices for the subcutaneous injection of insulin in the treatment of diabetes. Universal fit: May be used with Type A compatible diabetes pen delivery systems including: AutoPen, Byetta, Humalog, Humulin, HumaPen Memoir, HumaPen Luxura, InnoLet, SoloStar, NovoPen 3, 4, Echo and Junior; FlexPen, OptiClick, SymlinPen. Sterilized using ethylene oxide. Non-toxic, non-pyrogenic.