Detail Paint Brushes, 6 PCS Extra Fine Tip Micro Miniature Paint Brush Set, 20/0-0 round Tiny Small Brushes for Acrylic Watercolor Oil Model Painting Rock Crafts Paint by Numbers Adult Art Kit. Nicpro Detail Paint Brushes, 6 PCS Extra Fine Tip Micro Miniature Paint Brush Set, 20/0-0 Round Tiny Small Brushes for Acrylic Watercolor Oil Model Painting Rock Crafts Paint by Numbers Adult Art Kit.