A Cushioned Mouth Grip (CMG) enhances the original Fox 40 Classic Pealess Whistle. Innovative thermoplastic material provides superior grip and protection for your teeth. The Classic CMG is ideal for sports officials or anyone who needs to hold the whistle in their mouth for extended periods of time. Police, firefighters, emergency measure organizations, school crossing guards, lifeguards and boaters all use Fox 40 Classic CMG Pealess Whistles for this purpose and to maintain a safe and healthy environment. Better Grip. Better Control. Better Protection. Design: 3-chamber pealess with added CMG - Sound Power: 115 dB. - BLACK