This hot water bag stopper is made of rubber material, anti-aging, no peculiar smell. The hot water bag stopper is relatively supple, not easy to damage the bag mouth, and heat preservation is good, can always maintain the maximum area with the bag mouth. High density, not easy to break. Features -Color:White -Material:Rubber -Size:4.50X3.50X3.50cm/1.77X1.38X1.38in -Note:Caliber is 22.5 mm/0.88inch. -The right size of this water bottle stopper fits hot water bags well, with thread pattern design, owing good sealing function. -This replaceable stopper is very easy and simple to use and does not require a complicated operation process, ensuring efficiency and experience. -This stopper has a simple shape with excellent craftsmanship, which is both beautiful and practical, and the interesting shape is perfect for use. -This seal stopper is well-made, for the production of strict requirements, excellence and practical to use. -You can share the hot water sacks stopper with your family and friends because this bottle cap is practical, and they will be happy to receive it. Package list: 6 Water Bag Stoppers