Select a preset brush

Select a painting tool or editing tool, and click the Brush Preset pop‑up menu in the options bar.
Select a brush.
Note: You can also select a brush from the Brushes panel. Be sure that Brush Presets on the left side of the panel is selected to view the loaded presets.
Change options for the preset brush.
Diameter

Temporarily changes the brush size. Drag the slider or enter a value. If the brush has a dual tip, both the primary and dual brush tips are scaled.
Use Sample Size

Uses the original diameter of the brush tip if the brush tip shape is based on a sample. (Not available for round brushes.)
Hardness

Temporarily changes the amount of anti-aliasing for the brush tool. At 100%, the brush tool paints with the hardest brush tip, but is still anti-aliased. The Pencil always paints a hard edge that is not anti-aliased.