The brushes are connected to each other by a keychain, so you can hang them comfortably. Made of stainless steel and nylon bristles, dishwasher safe and straw safe. Good nylon bristles are not easy to pick. The brushes come with a removable and matching hardness key ring. Do not worry if you scratch your things when washing or more, such as glasses, jewellery, mobile phones, etc. Nylon brush set, special design for gap and blind angle that you couldnt clean properly with normal tools. 5pcs Bottle Pipe Cleaning Brush Set Nylon Cleaning Brush Set for Straws, Glasses, Keyboards, Jewelry, Durable and Useful, Useful and Practical