alternatively a non resettable drug delivery device i e a non reusable device a first end of the cartridge retaining part 2 and a second end of the dose setting mechanism 4 are secured together by connecting features for non resettable devices these connecting features would be permanent and non reversible for resettable devices these connecting features would be releasable in this illustrated arrangement the cartridge retaining part 2 is secured within the second end of the dose setting mechanism 4 a removable cap not shown is releasably retained over a second end or distal end of a cartridge retaining part or cartridge housing the dose setting mechanism 4 comprises a dose dial grip 12 and a window or lens 14 a dose scale arrangement 3 provided on a dose dial sleeve 9 is viewable through the window or lens 14 to set a dose of medication contained within the drug delivery device 1 a user rotates the dose dial grip 12 such that a dialed dose will become viewable in the window or lens 14 by way of the dose scale arrangement fig1 illustrates the medical delivery device 1 with the cover cap removed from a distal end 18 of the medical delivery device 1 this removal exposes the cartridge housing 6 of cartridge retaining part 2 preferably a cartridge not shown from which.