High quality wide mouth hydraulic straw cover made of quality materials that do not affect taste. BPA-free, safe, healthy, and easy to clean. Excellent design features a rocking nozzle for easier drinking. Inner rubber seal fits inside the cover liner to help prevent leaks. 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). Fits cups with an opening of approximately 1.81 inches. Suitable for most standard wide mouth bottles. Straw can be trimmed to desired length. Standard size straw cap fits most standard wide mouth bottles, including classic Kanteen models and 24-ounce containers. Ideal for everyday hydration needs. Material: Plastic Color: As Shown Package Contents: 1 x Bottle Cap 1 x Straw Note: Light and display settings may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3 cm.