• This Soundless Training Whistle is made of robust, nickel-plated brass in a high-gloss finish
• While this whistle is barely audible to humans, it can be detected by dogs up to a 400m range
• You can choose to maintain a constant pitch by locking the secure nut on the adjustment screw
• Includes a protective case (large whistle also includes a black protective cap to secure the tone setting)

Specifications: Brass Polished; Nickel-Plated; 75mm & 85mm