Stroke brushes tend to be long and flat. They are great for traditional calligraphy and creating borders as well as creating fine lines with the edge or wide strokes with the flat part. The bigger the number, the wider the brush.
Synthetic Sable Paint Brushes are the perfect go-to for any level of artist. Synthetic brushes are perfect for watercolor and gouache because they last longer than natural hair brushes and the bristles don't fall out while painting.
Proper care tips: Make sure to clean your brushes well after each use (with water) and only use these brushes with watercolor and gouache.