Freeman Tweaked Generation Brass D Whistle - NEW 2013 Model Beloved Generation sound without the squeaks, register breaks, and out-of-tune notes. The newer model features an attractive brass ring around the base of the mouthpiece to improve durability and prevent cracking when the whistle is tuned (updated pictures coming soon!) Jerry Freeman expertly tweaks mass-produced whistles to improve quality and produce a clean playing, beautiful sounding, nicely in-tune instrument that's well balanced throughout both registers.