HEAVY DUTY: Set of 4 Gazebo Sand Bag Foot Weights. Can be filled with either sand, grit rocks or any other available material VERY SECURE: Provide a weighted base to your Gazebo. Velcro straps for a quick and easy fit. Velcro closures prevent sand from spilling out during use MATERIAL: Fold flat for easy storage when not in use. Exterior Material: Heavy duty 600D Oxford Fabrics. Inner Lining Material: 100% highly water-proof oxford material. SIZE: Height: 40cm. Poorly balanced booms can tip over and damage valuable equipment without warning. Protect your equipment and let your booms reach farther by adding a sandbag. CAN BE FILLED WITH SAND / GRIT: This bag comes empty and can be filled with gravel, sand, rocks, or any other material to add weight. It can clip onto a hook, hang by its handle, or straddle a boom.