Features: PVC Construction : Made of PVC with reinforced edges , these cover weights resist leaks and bursts , ensuring reliable , long lasting performance. Two Easy Installation Methods : Method 1: Fill 70% with water or sand , then hang on the cover edge . Method 2: Inflate 70% and place in the pool. Effortless Filling and Draining : Wide openings allow quick filling/draining with most garden hoses . For winter , fill the pool cover weights above ground only 1/2 or 3/4 to avoid freeze related cracks (sand filling is also an option). Product material: PVC. Product dimensions: 35x24x0.3CM/13.78x9.45x0.1inch. Package includes: 10 x Pool Water Bags, 10 x Hooks, 5 x Repair Patches