Unlike brass brushes etc. where hair is growing like a toothbrush, straight hair is growing straight so it is easy to clean small parts. When dirt is persistent, it is easy to get dirty if you use it to strengthen and stab the part with the hair part. Still it is a metallic brush after all.
The hardness of the hair part is just right and it seems to be excellent also in durability. Since the motorcycle is a rim wheel, it comes in handy when cleaning, reaching the details. Expect to come out with Momotaro brand