1. It features fine grinding round corners which do not hurt the wheel and other objects.
2. It is made of high quality horse bristles which are implanted by machine and not easy to shed. 
3. It features long service life.
4. It features curved handle so that the front end of the brush is slightly curved for more comfortable to use.
5. It is small and convenient, durable and flexible, not easy to deform. It does not damage car paint.