B08QVDSK5K Mxfans 20x Joint Cork Sheets 5.91×3.9×0.06inch Woodwinds Repair Accessories Kit

Made of high quality cork, durable, soft and lightweight.
With excellent ability to compress.
With good flexibility, sealing, noise resistance, abrasion resistance, you can put it on the boiled water bottle for a while to prevent the cork from fracture.