High quality wide mouth hydraulic straw cover made of high-quality materials that do not affect taste. BPA-free, safe, and healthy. Easy to clean and maintain. Features an excellent design with a rocking nozzle for easier drinking. Ensure the inner rubber seal is properly placed inside the cover liner before use to prevent leakage. Simply turn the top upside down to drink with one hand—no need to unscrew the straw plug. Compatible with wide opening water bottles, including Hydro bottles (12 oz, 18 oz, 21 oz, 24 oz), and cups with a mouth diameter of approximately 1.81 inches. Fits most standard wide-mouth containers. The straw can be trimmed to desired length. Standard size straw cap for wide mouth bottles, suitable for classic Kanteen models, cold water bottles, and similar containers. Ideal for everyday hydration needs. Material: Plastic. Color: As shown. Package includes: 1 x bottle cap, 1 x straw. Note: Light and display differences may cause slight color variations between the image and actual item. Measurement allowance is +/- 1-3 cm.