Package Included: The bottle cleaner comes with 2 sets of cleaning brushes, black and white. Each color has 10 different diameter cleaning brushes, you can choose the right size. High-quality material: The brush is made of nylon and stainless steel, the brush is soft and elastic, and will not rust. The brush won't scratch the bottle, you can bend it for better cleaning. Tube brushes in various diameters: Cleaning brushes come in sets of 10 sizes including 3, 5, 7, 9, 12, 15, 16, 19, 21 and 25mm. You can choose the right one for various cleaning jobs. Wide application: The cleaning brush can be used for various cleaning jobs, such as bottle cleaning, cup cleaning, straw cleaning, test tube cleaning, keyboard cleaning, pipe cleaning, etc. Great for Difficult Cleaning Jobs: The cleaning brush has great elasticity and can be slightly bent to extend to hard-to-reach places, a great tool for better cleaning jobs.