This is a pack of Hobbytech Airbrush Cleaning Brushes. 

Nylon bristles in twisted-wire handles clean airbrushes, spray guns, mini tubing, drilled holes and more. Includes 5 sizes 2.0mm diameter to 5.0mm diameter.

Includes:
2.0mm Airbrush Cleaning Brush
2.5mm Airbrush Cleaning Brush
3.2mm Airbrush Cleaning Brush
4.0mm Airbrush Cleaning Brush
5.0mm Airbrush Cleaning Brush

Overall length 100mm. Ring mounted for easy storage