1. Features: Finger grip for plastic whistles. Shock resistant, non-toxic, harmless, smooth to the touch, no rough edges. Protects your mouth and teeth when blowing the whistle. Reduces friction between the mouth and mouth. Perfect pocket size to carry around Perfect for coaches, referees, and officers, as well as trainers and traffic police officers. 2. Size: Approx. 0.8 x 0.7 inches (2.1 x 1.8 cm); 3. Contents: 10 finger grip covers. 4. Caution: There may be cases where the whistle cannot be used. Please check the size and shape before purchasing.