Thank you for visiting our ebay store! Fox 40 Classic CMG whistles has the same great qualities as the original Fox 40 Classic whistle. The CMG stands for cushioned mouth grip. From sports officials to lifeguards and crossing guards, the innovative thermoplastic CMG provides superior grip and protection for your teeth. Adjustable Finger Grip in Thermoplastic Rubber Material. - Fox 40 cannot be overblown-the harder you blow, the louder the Sound - CMG made of Thermoplastic is preferred by Officials who hold the Whistle in their Mouth to assure a secure Grip - Pealess Design, No moving Parts-nothing to obstruct Sound, nothing to jam, break or freeze - 100% constructed of high-impact ABS plastic-So they're 100% impervious to Moisture - 115 Decibels of high pitch Shrill rises above ambient Noise-can be heard up to a Mile awayFox 40 Classic CMG Official Finger Grip Whistle