A sand bag is a what's known as a "Silent Grip" because it does its job efficiently without any complaints!
Sand bags are necessary safety items. They prevent light stands from tipping over. They provide a down and dirty place to support a camera and also act as counterweights for booms. If you have people, especially children in your studio, a sand bag can prevent them from knocking down an expensive lighting fixture or worse causing injury to themselves or others.
