The "Wooster 1" Softip Wall/Trim 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.
1": This measurement shows the breadth of the brush, with "1 inch" being the size in this example. It implies that the brush is one inch wide, making it ideal for covering greater areas efficiently.
The name "softip" most likely relates to the type of filament used in brush bristles. The term "softip" refers to bristles that are soft and flexible, which can help in smooth paint application and reducing brush traces on surfaces.