The Advance Potty Training Bells come with 6 pieces. 2x black, 2x brown paws and bones & 2x red with paws. Hang the bells on the door handle for easy set-up and let your dog tell you when he needs to go out. Simply jingle the bells when you take your dog out, and reward him when he begins to use the bells himseft to ensure his new habit sticks. There are 2 handy snap options to choose between 27-inches & 31-inches in length to accommodate most doors and sizes. "Coastal reserves the right to ship kits incomplete with no substitutions."