Compatibility Excellence: Pour spout lids are designed for a seamless fit with all wide mouth mason jars. Universal compatibility includes popular brands such as Ball and Mason, fitting jars with a diameter of 8.7 cm / 3.4 inches. Enjoy a precise fit and reliable performance for everyday jar use.Evolutionary Design: Upgrade your mason jars beyond traditional use. The flip cap pour spout lid transforms mason jars into convenient, easy-to-pour pitchers for liquids. This innovative lid adds versatility and practicality to your mason jar experience.Airtight Sealing: These mason jar lids provide a strong airtight seal. The screw-on flip cap design helps extend shelf life and preserve the flavor of salads, dressings, juices, and more. Keep stored items fresh and well protected.Quality Construction: Made from reusable, food-grade plastic, these lids are BPA-free, ensuring safety and cleanliness. Dishwasher safe for easy cleaning, they offer a hygienic and durable storage solution. Suitable for refrigerator storage.User-Friendly Design: Featuring a built-in pouring spout and an anti-slip grip, these lids allow for smooth, controlled pouring. The flip cover provides excellent leak-proof performance, minimizing spills and mess. Ideal for everyday pouring and serving.Material: Plastic Color: Black Package Contents: 4 x Bottle Cap Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.