These are different colors of blades attached to Chippawa RB blades and DD blades.　Some of you who are familiar with spinner baits may have changed blades to adjust to the conditions of the moment, and this is often an effective tuning for crankbaits as well!
 
For example, if you want to match the baitfish more, use silver, if you don't want it to shine too much, use gunmetal, if the water is muddy, use copper, etc. Match the blades according to the conditions and your preference at that time.