Premium acrylic brushes for creating acrylic structure nails are flexible, but still retain their shape well.
Acrylic Brush - Roubloff - AK33R-4
Acrylic Brush - Roubloff - AK33R-6
Acrylic Brush - Creator - 10 Kolinsky
Acrylic Brush - Creator - 8
Acrylic Brush - Creator - 8/LL
A Brush’s Best Friend - 150ml