Fox 40 Classic Referee Whistle CMG with Fingergrip. This is the one that changed the game! Authentic. Original. Fox 40's first patented pealess whistle. For referees and coaches at every level who depend on the reliability of the Classic, but prefer a fingergrip style. Fox 40 Classic Pealess Whistle with added Cushioned Mouth Grip (CMG). Adjustable fingergrip size. Ergonomic, ultrasonically welded extension grips to fingers' users. Fits securely and snug over group of fingers. The 115 decibels of power ensures every call will be heard above the crowds and players! Better Grip. Better Control. Better Protection.