My favorite!
I love these brushes!
I use them to add shadows or highlights on my art journal projects and I just can't find any other similar product to them. Their india ink is transparent so they are great to layer, they dry permanent and when used on non-porous surface they allow a few second to smudge them for a softer blend.
Their barrel is big and holds lots of ink, so givven the way I use them they never dry on me... I have them for years. Just make sure to take a good care of the brush nibs... don't touch other wet mediums with them and you will enjoy these markers for years and years!