The Fox 40ClassicCMGFingergrip is cushioned to enhance the original Fox 40ClassicFingergrip whistleThe Cushioned Mouth Grip (CMG)s thermoplastic material provides superior grip and protection for teethIdeal for those who need to hold whistle in mouth for extended periods of timeFingergrip model has adjustable fingergrip that fits securely and comfortably over group of fingersNo moving parts to freeze, jam or deteriorateFlawless, consistent and reliableThe harder you blow, the louder the soundEasy to blow and cannot be overblownChambers are designed to self-clear when submerged in waterWill be heard above ambient noise, loud crowds, the roar of engines, breaking waves and thundering gale-force windsSound will be heard up to a mile away