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You're going to need some templates. There are a number of things about concentric balls that require to be, well, perfect. Or nearly so. Here are some examples:

There are a few general types of templates you'll need:

2-1/2" circleimage
Template with a 2-1/2" circle cut out of itimage
1/8" alternating color concentrig circlesimage

You can make templates with a decent quality compass and some card stock. I recommend getting a 2-1/2" craft punch that will make perfect circles every time. As for the concentric circle template, I used Visio to make one that I use frequently. You can download below.