Application: These bottle cleaner brush are suitable for cleaning baby bottles, straws, coffee machines, kettle tea spouts, straws, keyboards and more. Unique Key Ring Design: Straw cleaning brush is equipped with a detachable key ring, you can quickly separate them or put them together according to different needs,you never have to worry about losing them. Efficient Cleaning: Different sizes of pipe cleaners brush are suitable for cleaning in different places, easy to get into hard-to-reach spaces, and wipe away any food, dirt or any stains without damaging anything you are cleaning. Multiple Size: You will receive 12pcs nylon bottle cleaning brushes with different diameters, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 16mm,18mm, 22 mm. It can meet the cleaning needs of different places. Material: Our bottle brushes is made of stainless steel and durable food-grade nylon bristles, which are not easy to fall off and will not damage the bottle surface.