trixie dog activity trainings discs chroomThese are five metal discs used to give the "come" command. The special sound these five metal discs emit makes them an ideal training aid. Give your dog a signal to correct or encourage his behavior with these discs. The training discs come with a booklet containing tips and tricks for optimal use. The discs are tied together by a string that feels comfortable in the hand. Training discs from Trixie Ideal for, for example, the "come" command Includes