General purpose counterweight can be used with any light stand or boom. Includes “Hi-Vis” yellow stripes so it is easy to see in a darkened studio, prevents accidents. Sandbag has two pockets which can be filled with sand to produce the proper counterbalance effect (sand not included.) Also includes a hook to hang from a boom arm and a heavy duty sewn handle with metal reinforcement plate. Overall size is 9.5x20.5 inches. Each pocket is 9.5x9 inches.