LOOK: NFL refs used wrist-mounted horns before whistles
![](https://cbssports.com/images/blogs/NFL_Referee_Air_Horn_Arm_Mounted_Whistle_Image.png)
What are the black string-like things football referees wear on their hands for? - Quora
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Reconnecting Roots, Baseball: First Pitch, Season 3, Episode 307
![](https://sportsnaut.com/wp-content/uploads/2020/07/NFL-referees-COVID-masks-2020-season.jpg)
NFL refs expected to wear masks, could use electronic whistles during 2020 season
What are the black string-like things football referees wear on their hands for? - Quora
![](https://i0.wp.com/www.footballzebras.com/wp-content/uploads/2020/12/MikePereira_CottonBowl.png?resize=400%2C240&ssl=1)
NFL100: Before they were zebras, they were … candy canes? – Football Zebras
![](https://i0.wp.com/www.footballzebras.com/wp-content/uploads/2012/11/Fox40Whistle.jpg?resize=200%2C225&ssl=1)
Whistle while you work, NFL referee style – Football Zebras
![](https://www.washingtonpost.com/wp-apps/imrs.php?src=https://www.washingtonpost.com/news/magazine/wp-content/uploads/sites/69/2019/01/sfafootball_025-001.jpg&w=1450)
Baltimore's St. Frances Academy has a football team so good, no one in its league will play it - The Washington Post
![](https://www.jconline.com/gcdn/authoring/authoring-images/2023/12/06/PLAI/71820233007-harrison-ccgbb-112923-am-01789.jpg)
Indiana referee shortage stems from crowd abuse at youth sport events
![](https://i0.wp.com/www.footballzebras.com/wp-content/uploads/2018/09/AndersonBoston.jpg?resize=400%2C240&ssl=1)
Whistle while you work, NFL referee style – Football Zebras