Train your dog with sound. These small curved discs are the result of years of research into dog behaviour and training. The Trixie discs produce a unique noise when dropped that can't be confused with everyday sounds. The discs make no sound when you pick them up and carry them around, which means that if you drop them when your dog does something you don't want him to, they will associate the sound with that behaviour. This gives you a simple and effective training method with speedy results. The packaging includes instructions for use, and tips for training. Trixie Dog Training Discs at a glance: 5 metal discs on a nylon ribbon Ideal for dog training Behavioural training using sound Dimensions: 4.5cm diameter Chrome plated Includes training guide