Set of 17 Cleaning Wire Brushes for Dremel Rotary Tool Include 17pc Assorted Cup Brushes, Pencil Brushes, Wheel Brushes and Mandrel Shank: 1/8" Material: Brass, Nylon, Stainless Steel, Leather, Green Abrasive and cloth .Great for Cleaning and Polishing Most Ferrous Metals, Stones, Glass and Ceramics