Designed to prevent pool covers from being blown around, ensuring stability in windy conditions. and leak-proof construction, to cracking and leaking, suitable for extreme weather. Wide-mouth design for easy filling and draining; recommended to fill halfway to avoid freezing. Versatile design adapts to various pool cover shapes, including round, rectangular, and custom shapes. Sealed edge and leak-proof valve design maintain weight and stability while preventing leakage. These water bags are essential for securing your pool cover against strong winds and harsh weather. Their construction ensures long-lasting use, while the easy-to-use design allows for quick filling and draining. Whether you have a round, rectangular, or custom-shaped pool cover, these bags fit securely, providing peace of mind during the off-season. Color: Blue Material: PVC Package Contents: 16*Pool Cover Weights Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.