3 Gel brush with angled hair
The 3 gel brush differs from round or tapered design brushes through its angled-cut hair. In professional use, this shape is often called an "Angular" or angled brush: The angled edge lets you apply the gel in a guided way and set straight edges without having to twist your hand position.
The angled shape plays to its strengths where surface and edge meet — for example, when cleanly refining transitions or when working along the smile line, where the edge needs to be set sharply. If you have been working with straight brushes and regularly have to touch up your edges, you will find this the more suitable tool: The angle takes over part of the guidance that you would otherwise have to get from your wrist.
For nail designers who assemble their brush selection deliberately by technique, the 3 with angled hair complements the classic round and detail brushes with a shape that noticeably makes straight lines and controlled surfaces easier — a tool that gets picked up more often in everyday work than you might think.