They are very soft and don't hold their shape very well
Although the black brush is our most popular, it is not the best brush for everyone. The white, or even the orange brush, is probably better for your application. You can see brush comparison information here:
My family has had Dishmasters since I was a little girl (about 70 years ago). Of course, it’s natural that I need replacement brushes, but they do last a long time.
You got to love Dishmaster and the products they make.
I have used them for years.