SE 7614GCB-3 Double Ended Gun Cleaning Brush Set 3-piece gun cleaning brushes include: (1) plastic bristles (2) nylon bristles (3) copper bristles Double ended: larger side with 3 rows of bristles and a smaller side with 1 row of bristles Versatile cleaning capabilities with both a large and small end so that you can get to all the hard to reach places Overall length: 7-inch Can be used with acid, glue, paste, etc.