material: and thick poly handle, high strength, strong durability, long service life, can resist the abrasion, tearing, impact, and flattening of bristles, it can clean unfinished metal parts, and not affect the or fine features :The stainless steel tooth marks on the inner side have a strong hardness and a strong ability to remove rust. Packing quantity: you get is 12 pieces of pipe cleaning brushes, including a set of 1/2 inch, 3/4 inch, and 1 inch; Each size has 4 pieces, which can be applied to clean pipes of different sizes The of the pipe cleaning brush is designed to increase friction streaks, which is helpful for us to strengthen our cleaning and achieve better cleaning results. Reasonable combination: in order to adapt to more sizes, we have combined 3 sizes of cleaning brushes and sold together, so that you can deal with the situation that different sizes of pipes need to be cleaned at any time, and complete the cleaning work more effectively, Manufacturer: Jnchdghwa