1、Durable Bristles: Made of copper and steel wire, the bristles are durable and chemically resistant, suitable for long term use. 2、Multiple Sizes: There are totally 62 pieces in the package of different sizes to meet your needs, very practical! 3、With Storage Box: These brushes are well packed and sorted in the box that you can take it in and out to help with your work. 4、Ideal Replacement: These brushes have different sizes, ideal for tube cleaning and replacement for the old and damaged parts. 5、Fine Workmanship: These brushes are well made that they provide long life span and work with perfect performance. Item Type: Universal Cleaning Kit Material: Copper Wire, Steel Wire, Plastic Product Size: Approx. 390 x 265 x 50mm/15.4 x 10.4 x 2in 1 x Universal Cleaning Kit