1. Four Velcros: The handle and 4 Velcro straps design make the sand weight bag easy to attach to your frame leg, the high quality velcro will ensure the weight bags stay securely attached to your canopy tent legs. 2. and : 1680D polyester fabric coating with PVC, strong and durable, stronger than most weight bag on market. Inner: PVC coating prevents sand leakage and keeps weight. 3. Set of 4 Weight Bags: Each pack tent canopy weight bag can hold up to a maximum of 37.5lbs of weight in sand, rock, dirt and other contents, premium weight bag for any canopy or tent.(No including sand) 4. Reduce Unnecessary Trouble: Use Velcro seals instead of zippers, you will not worry the zipper broken Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.