The tip that doesn't split is the most important feature of a good nail brush. It's stiff but springy and very precise. It will make all the difference when applying the product in the cuticle area and modelling a smile line.
Tight belly quickly creates the structure of the nail. It doesn't spread and has a stable pressure point.
This brush won't turn the French tip yellow.
Specific References
Oval Brush - confident, long-term comfort of your work