The present invention is generally directed to a drug delivery device for selecting and dispensing a number of user variable doses of a medicament and to a housing (10) for such a device. The housing comprises a twin-shot injection moulded casing with at least one window (11a, 11b, 11c) and at least one interface (12, 13, 14, 15, 16, 17, 18, 19) for engaging a further component part (20, 30, 40, 50, 60, 70, 80, 90, 110, 120, 130) of the drug delivery device. The casing comprises a first shell (10a) injection-moulded in a translucent material and a second shell (10b) injection-moulded in an opaque material. Further, the invention is directed to a method for producing such a housing (10).本發明總體涉及用於選擇和分配藥劑的若干使用者可變劑量的藥物傳送裝置並且涉及用於這種裝置的殼體(10)。該殼體包括雙射注塑外殼,該雙射注塑外殼具有至少一個窗(11a,11b,11c)和用於接合藥物傳送裝置的另外元件(20,30,40,50,60,70,80,90,110,120,130)的至少一個結合部(12,13,14,15,16,17,18,19)。外殼包括以半透明材料注塑成型的第一外殼(10a)和以不透明材料注塑成型的第二外殼(10b)。另外,本發明涉及生產這種殼體(10)的方法。10‧‧‧殼體(外殼)11a-c‧‧‧窗13‧‧‧帶材20‧‧‧藥筒保持器70‧‧‧按鈕80‧‧‧劑量選擇器