An airbrush is only a true Iwata when it contains genuine Iwata parts. To keep your airbrush operating at peak performance, make sure the model number on the side of your airbrush is listed below. What makes a Custom Micron special is that every head system is custom matched and hand-tuned to meet Iwata’s rigorous performance standards for superior atomization. Replacement Head Systems are tested and tuned to the same standards to ensure that Custom Micron will maintain its precision over time.Our parts are precision crafted on the industry’s most sophisticated machinery using the finest materials for consistent quality and performance. Every batch, every time.