3 Pcs Rose Gold Nail Art Liner Brushes Set, UV Gel Acrylic Application Nail Pens Nail Art Designs Tools(7mm/9mm/11mm)

I actually use these to paint fine details on dolls I'm customizing, but they work pretty well for that too! So I imagine they're probably good for detail work on nails too.

The photo shows a clear distinction in the length of the bristles. What I got almost looks exactly like all 3 are one length. I'd suggest shopping around.