Referee Volleyball Blue String Three Hole Metal Whistle Product Name : Training Whistle;Material : Metal, Nylon Color : Silver Tone, Blue;Whistle Size : 9.3x 2.5cm/3.6" x 0.98" (L*D) String Girth : 96cm/37.8";Total Length : 61cm/24" Weight : 44g Package : 1 x Training Whistle