simply fill your bottle with hot water, then screw the stopper securely to prevent any leaks. The durable rubber material ensures a tight seal, making it suitable for use in bed, on the couch, or while traveling. Enjoy the warmth and comfort without worrying about spills. Features -Color:White -Material:Rubber -Size:3.50X2.50X2.50cm/1.38X0.98X0.98in -Multipurpose use: these stoppers are suitable for a variety of hot water bottles, making them a practical addition to any home - material: crafted from durable rubber, these stoppers are designed to be durable and resistant to aging, ensuring they last -Water tight seal: the stoppers are engineered to provide a tight seal, preventing any leaks or spills and keeping your hot water bottle secure -Effortless operation: easy to install and remove, these stoppers are user friendly and suitable for quick and convenient use -Convenience: the stoppers set is offering easy replacements and spares, are always prepared for any situation Package list: 3pcs Hot Water Bottles Caps