The "Wooster 3" Amber Fong Brown China Bristle Kaiser Varnish Brush" is a unique type of paintbrush made by Wooster Brush Company. Here's a breakdown of the components:
Wooster: As before, this refers to the brand name, Wooster Brush Company.
3": This dimension shows the width of the brush, with "3 inches" being the size in this example. It implies that the brush is three inches wide, making it ideal for covering greater areas more rapidly.