Noise and vibration are used to simulate the distress signals of many prey animals. The double rattling sound and vibration are determined to be detectable by the lateral line that fish pass through. The color of the beads acts as a visual stimulus that predatory fish find difficult to resist. Three different colors for you to choose from meet your different needs. The double rattle adds additional noise to the device and the length of the hook. 84N-5P6Z