Jackson's : Artist Hake White Goat Hair Brush : Flat : 2.25in (60mm) | Jackson's Art Supplies
Series 1220 Hake Brushes | Holbein - Cheap Joe's Art Stuff
Herend Brush Series F-1700 (25mm ~ 100mm) For Watercolor With Goat Hair/hake Flat Paintbrush, Very Soft And Thick. Art Supplies - Paint Brushes - AliExpress