Acme Shepherds Mouth Plastic Whistle is a tough plastic shepherd sheepdog whistle that is guaranteed to manage a controlled range of pitches to help you guide your dog. Once blowing, vary the blow to create different sounds and instructions plus it is extremely comfortable in the mouth. A vital accessory for the sheep dog trainer and handler. Available in a range of different colours, part of the fantastic range of outdoor whistles and calls from Acme. Colour: Blue, Black, Green, Purple, Red, Yellow