Harder & Steenbeck nozzles are made to exacting standards. All H&S nozzles include a solvent resistant nozzle seal.
The 0.15mm - 0.6mm nozzles are for various Harder Steenbeck airbrushes. 0.8mm - 1.2mm nozzles are for the Harder Steenbeck Colani airbrush only.
The nozzle size you select needs to match the neddle and air cap that the airbrush is equipped with!
To change the nozzle size of your airbrush refer to Harder Steenbeack Nozzle Sets