Levemir Penfill cartridges are designed to be used with Novo Nordisk insulin delivery systems and NovoFine or NovoTwist needles.1 ml of the solution contains 100 units insulin detemir (equivalent to 14.2 mg). 1 cartridge contains 3 ml equivalent to 300 units. 3 ml solution in cartridge (type 1 glass) with a plunger (bromobutyl) and a rubber closure