A syringe comprising a first coding feature for mechanical interaction with a second coding feature of an auto-injector device is provided. The first coding feature is designed such that the syringe is only mountable in an auto-injector device having a second coding feature mating the first coding feature. Furthermore, an auto-injector device having a housing, wherein a syringe can be mounted, and a set of at least two auto-injector devices and syringes are provided.
