Interactive, colorful balls were made with bells inside to entice your kitty with a lively sound and rattling movement.Pack comes with four multi-colored toys—your cat will have multiple jingle balls to entertain herself, and you'll be able to keep track of them, thanks to their distinct colors. Those bright colors will be easy to see and might be less-likely to cause human slips and falls. Jingling sound holds her attention by simulating noisy prey and further encouraging her instincts. Encouraging her hunting instincts may avoid boredom, restlessness and behavioral issues—hide these around the house to provoke her desire to hunt.