A "Wooster 1" Acme Foam Brush" is a special sort of painting tool. It is a foam brush made by Wooster Brush Company, a well-known manufacturer of painting equipment and accessories. The "1 inch" measurement most likely refers to the brush's width, indicating that it is a small brush designed for detailed work or small surface areas. Foam brushes are commonly used to apply paint gently and evenly, particularly on surfaces where a smooth finish is desired. They're popular for crafting, trim work, and touch-ups. Wooster is known for providing high-quality brushes that make painting operations easier and more efficient.