In a nutshell, because they are safer than steel; there is no ricochet or bullet splatter. They are popular at outdoor ranges because bullets pass through THROOM™ targets intact, which makes lead collection much easier. THROOM™ targets make it possible for indoor ranges to shoot reactive targets indoors and they make indoor ranges much easier to maintain with no bullet splatter damage to walls, ceilings, and light fixtures. You can shoot them up close. They are a great reactive target alternative to paper targets because they are fun to shoot. Also, easy-to-carry, seven times lighter than steel, a bright fluorescent green color and they can be shot at -40F to +120F – they are all-weather targets and may be left outdoors.