A whistle like no other! Designed specifically to encompass a flexible fingergrip.

Features:

• The Fox 40 Caul® has a traditional harmonized trill tone and clear
  loud sound
• The Cushioned Mouth Grip (CMG®) provides soft contact area and reduces impact on teeth
• Compact pealess design for flawless performance
• Flexible fingergrip fits various hand
  sizes and reduces transfer of impact energy to the hand
• No moving parts to freeze, jam or deteriorate
• Flawless, consistent and reliable
• The harder you blow, the louder the sound
• Easy to blow and cannot be overblown
• Will be heard above ambient noise