The Logan Turbo - solid brass whistle A big favorite with Sheep Dog Trial competitors as dogs react very well to its tones even in very difficult conditions. The Logan Turbo solid brass whistle is precision crafted from a solid piece of top quality lead-free brass.  The Turbo design affects the timbre (or 'voice') of your whistle tones in a way that really helps them cut through interfering sound.  It has the capability of even greater volume for those who work at distance or where there is the possibility a lot of sound interference.   The brass Logan Turbo comes with a Logan Whistle pouch.   Weighs 20 grams; measures 4.8cm (1 7/8 inches) across at the widest point.