LEIGAO I4 Sand Weight: It can easily stabilize any tent or fold. With a set of durable universal weight bags, your outdoor activities will be more fun and enjoyable. HIGH QUALITY MATERIAL: These weight bags are made of durable 600D Oxford cloth. Easy to install and release, never tear. When fully filled with sand or any available material, each bag weighs about 30-35 pounds. Double Zipper Design: Each bag has two zipper sections for sand, gravel or whatever you like. Do not leak and damage during use, and protect your gazebo from wind and rain. Velcro straps: Our sandbags come with velcro straps for securing and double stitching for durability. Size: 32.5*12*40.5CM Colour: Black Packing list: 4pcs