Features: This stopper is made of silicone material, practical, convenient and durable. There are sufficient bottle plugs to meet your different needs while you are using. It has a simple design, but very practical in use, giving you a good using experience. The proper size fits for most kinds of heat preservation bottle in the market. Appropriate replacement supplies for water bottle. Featuring high grade material, safe and hygienic. Specifications: Material: Silicone S Diameter: Approx. 1.38inch(3.5cm) L Diameter: Approx. 1.57inch(4cm) Package Includes: 1x Silicone Bottle Stopper note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.