Features: The toothbrush for head is made of copper wire; it is consisting of 30 brush holes and each one with 50 copper wire. This product is special designed for 3D printer nozzle hot bed cleaning. The parts of brush handle have adapted curved streamline design. The brush for head and handle has been curved, it can increase the contact area between handle and hands effectively, contributing to reducing the grip during use. The toothbrush for head has a bigger work area than ordinary brush, its copper wire with moderate hardness, which could effectively improve the work efficiency. Please heat the nozzle to 190° C when you use it to cleaning nozzles. The copper is relatively soft and easily deformed. Therefore, the brush for head may be deformed or warped during transportation. It can be used for mechanical polishing and rust removal. It can also be used in some small crevices, such as door and window borders, sofa or floor tile gaps, etc., which are difficult to clean. Specifications: Product name: 3 rows of copper-plated wire brushes Size: 17.2 x 1.2cm/6.77x0.47in 3 rows and 10 columns with 30 holes in total Material: copper-plated wire + plastic handle Package Includes: 5PCS x 3 rows of copper-plated wire brushes note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!