If you can’t find the right INAIRS model for your headphones, please measure the diameter of your headphone’s nozzle. Then select the fitting AIR model:AIR1 covers a nozzle diameter ranging from 4.6 to 5.4 mmAIR2 covers a nozzle diameter ranging from 5.5 to 6.5 mmAIR3 covers a nozzle diameter ranging from 3.2 to 4.0 mm If the diameter of your headphone’s nozzle exceeds, falls below or in between these measures, we are afraid we can’t provide you with INAIRS.