<P> American football officials generally use the following equipment: </P> <Dl> <Dt> Whistle </Dt> <Dd> Used to signal a reminder to players that the ball is dead; i.e., that the play has ended or never began . </Dd> <Dt> Penalty marker or flag </Dt> <Dd> A bright - yellow - colored flag that is thrown on the field toward or at the spot of a foul . For fouls where the spot is unimportant, such as fouls which occur at the snap or during a dead ball, the flag is typically thrown vertically . The flag is wrapped around a weight, such as sand or beans (or occasionally ball bearings, although this has been discouraged since an incident in an NFL game demonstrated that those could injure players), so that it can be thrown with some distance and accuracy and to ensure it remains in place and not moved by wind . Officials typically carry a second flag in case there are multiple fouls on a play . Officials who run out of flags when they see multiple fouls on a play may drop their hat or a bean bag instead . </Dd> <Dt> Bean bag </Dt> <Dd> Used to mark various spots that are not fouls but which may be possible spots of penalty enforcement or illegal touching of a scrimmage kick . For example, a bean bag is used to mark the spot of a fumble or the spot where a player caught a punt . It is typically colored white, blue, black, or orange, depending on the official's league, college conference, level of play, or weather conditions . Unlike penalty flags, bean bags may be tossed to a spot parallel to the nearest yard line, not necessarily to the actual spot . </Dd> <Dt> Down indicator </Dt> <Dd> A specially designed wristband that is used to remind officials of the current down . It has an elastic loop attached to it that is wrapped around the fingers . Usually, officials put the loop around their index finger when it is first down, the middle finger when it is second down, and so on . Instead of the custom - designed indicator, some officials use two thick rubber bands tied together as a down indicator: one rubber band is used as the wristband and the other is looped over the fingers . Some officials, especially umpires, may also use a second indicator to keep track of where the ball was placed between the hash marks before the play (i.e., the right hash marks, the left ones, or at the midpoint between the two). This is important when the ball is re-spotted after an incomplete pass or a foul . </Dd> <Dt> Game data card and pencil </Dt> <Dd> Officials write down important administrative information, such as the winner of the pregame coin toss, team timeouts, and fouls called . Game data cards can be disposable paper or reusable plastic . A pencil with a special bullet - shaped cap is often carried . The cap prevents the official from being stabbed by the pencil while it is in his pocket . </Dd> <Dt> Stopwatch </Dt> <Dd> Officials will carry a stopwatch (typically a digital wristwatch) when necessary for timing duties, including keeping game time, keeping the play clock, and timing timeouts and the interval between quarters . </Dd> </Dl> <Dd> Used to signal a reminder to players that the ball is dead; i.e., that the play has ended or never began . </Dd> <Dt> Penalty marker or flag </Dt>

What are the black bands on football referees hands