TAM87046 (There are 2 different #87046 Brushes, one that has a *300 after the part number, and one that has a *250 after the part number - pick which one you need)
*250 is a smaller brush size than the *300
Note: Tamiya does not indicate on their website that there are 2 different 87046, but there are.
Brush Overview:
Tamiya Flat Brush. High Finish (HF) brushes feature specially designed resin bristles for use with plastic model paint. This flat brush has stiff, evenly-aligned bristles. Package includes one brush.