The MACK 1962 Series Jet Stroke "Truck Letterer" is an excellent overall lettering brush. It is normally used for larger lettering and production lettering. It can also be used as a fill-in brush and an outliner for large letters. The long hair length allows the brush to carry a lot of paint. This brush is suitable for most surfaces. It is a mixture of pure squirrel and black ox. It has a flat ferrule and the hair comes in graduated lengths.