This is a cleaning brush for endoscopes, but would it be suitable for cleaning extremely thin tubes? The brush head is 3mm in diameter and has brushes on both ends. The length is 160cm. Set of 3 * Will be shipped in an envelope without packaging. The LOT number and manufacturing date are listed, but the expiration date is not. It seems to be 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.