12 New Brass Cup Brushes. This is a new set of 12 brass wire cup brushes. These are great for cleaning, polishing and producing special finishes. Precision made excellent quality. Use on yellow metals such as copper and brass. Straight or lightly crimped wire produces a more pronounced finish and is used for cleaning, deburring and surface finishing. Crimped wire achieves a softer or matte finish. Each is mounted on a mandrel with a 1/8" (3 mm) shank. Each brush head measures approximately 3/4" (19 mm) in diameter. We work hard to update our descriptions and pictures of our merchandise. As part of a process of ongoing innovation by our suppliers, newer versions of the item shown may be shipped before we are able to complete an update. As a result there may be a slight variation in color and design.