An assault line is a three-metre line from the net that indicates the maximum distance a back-row player may move to smash a ball from above the net. The attack line should be marked on the court with tape or cones. The attack line helps protect against dangerous attacks where players might be tempted to go for spectacular shots that are out of bounds. Also, it gives opposing teams an idea of when they can start blocking their shots. In addition, there is a drop zone between the attack and defense lines. A player can drop the ball here if he or she wants to send a message to the opponents or simply because they need a moment to think about their next move. Finally, there is the floor area behind the service box which serves as a refuge for unreturned balls or players who have been hit by a hot shot. This area is protected by a mesh screen that prevents balls from entering it unless they hit the side of the service box first. During a point, players cannot touch the ball with their hands or arms except for the net handlers. They can use their bodies to block or pass the ball though. If a player uses his or her arm more than 3 inches away from their body, it's considered a foul.