Introducing the Valkeen-style whistle at Rocky Top Referee Supply! This superior-quality whistle, featuring long-lasting durable materials, excels in outdoor settings with its clear-cut, high-pitched tone that carries long distances. The unique Flip-Grip mechanism ensures ease of use and unparalleled performance. As the official whistle of the FIFA World Cup in Brazil, its dual-frequency design sets it apart for professional and volunteer referees alike. Upgrade your officiating toolkit with the dependable Valkeen-style whistle and experience the difference in every match.