Neewer Black Heavy Duty Photographic Studio Video SandBag (4-Pack) Can be filled with anything:sand, gravel, even nuts and bolts. Extremely durable professional sandbags made of heavy duty construction. Sandbags are useful in the studio to help stabilize your lighting equipment. Easily attaches to the tripod legs. Ideal for light stands, boom stand and tripod.NOTE: Tripod is not included. Bags are empty.