High Quality - These tube brushes are Nylon bristle and stainless steel lever, with good elasticity, lint free, will not rust and is environmentally friendly and durable. Together by one door - Keys - All brushes have a convenient loop on the handle for hanging when not in use, not easy to lose. Easy to install and use - Tube brushes can be taken apart quickly or Installed with the keychain, there is capillary protection of the dispensing tip from scratching your instrument. Application - Tube brush lever is flexible, can clean corners, can effectively remove stubborn dirt, soft handle, easy to use, and it won't hurt inside the instrument to remove any dirt. Suitable for milk bottles, the spout of the keypad, test tubes, glass bottle and small nozzle, espresso machine, etc. Delivery quantity: 12 test tube brushes