Why are some clubs different colours?

You may see on your mobile app and dashboard that you have some clubs which are yellow or are different colours to your other clubs. When you create a club in 'My Bag' that is the same type of club as an existing club, for example you add a second putter,  it is displayed as a different colour so that you can identify which club is your old putter and which one is the newer one. This helps distinguish your clubs when you are looking at your clubs performance data.