This is an airbrush, compressor, or other airbrush related accessories for modeling use.
From the Iwata Medea website:
The workhorse of the Kustom line, the CS features a large general-purpose nozzle/needle combination. Still maintaining fine-line control, the CS creates wide background sprays with fine atomization and control. Designed to spray metallic, pearlescent and base-coat paints.
0.35 mm “Self-Centering Nozzle and Needle Combination”
PTFE needle packings
Large, 14 cc (1/2 oz.) gravity fluid cup
Taller trigger for extreme control of trigger action and paint flow