Cleaning brushes for endoscopes, but how about using them for cleaning extremely thin tubes? The brush part is 3mm in diameter and has brushes on both ends. The length is 160cm. Set of 6 * Will be shipped as is, in an envelope without packaging. The LOT number and manufacturing date are listed, but the expiration date is not. They are well-made and should be suitable for cleaning tubes. No individual sales or price reductions. Shipping and messages will be unavailable on weekends and holidays.