LimoStudio 4 Pieces Saddlebag New Sand Bag Heavy Duty Weight Bag, Black Color, Holds 18lbs for Photo Studio Light Stand & Boom Stand, AGG1845 Contents: 4 x Studio Photo Video Stand Sand Bag Light Stand Saddle Bag Light Weight , Versatile and Compact (Net Weight: 9 Oz., Size: 20 x 10 inch) Strong and Durable : Self Stand Alone Bag, Strengthened by PVC Pad inside, Can be filled, emptied, and refilled as many as you wish Convenient Pre-measured Weight Gradation: Measured by Sand Simply hook it to a light boom arm or put on boom light stand