The basics Kett .4mm Airbrush perfect tool for Hydro Proof Makeup application. The benefits The .40mm nozzle offers a wider spray pattern for larger areas on the face or body. The uses Ideal for face and body with its 4.mm nozzle and dual action lever, and the perfect tool for covering tattoos to body art applications. The bottom line Kett .4mm Airbrush is a perfect Airbrush for fine detail work and perfectionists.