Insulin pen needle FeaturesSterile: EO gas, non-toxic, non-pyrogenic.Size: 29G-32GNormal length: 4mm-12mmColor: different colorsDiabetic care disposable products, for quick and convenient insulin injection, single used with insulin pen.Silicone lubricant coating on insulin pen for smooth injectionEasy to use, simply twisting on and offCE, ISO13485 certificate