What is the silver ball / spring in my shaker for?

Take the silver ball / spring out of the plastic bag and pop it back in your shaker.

The shaker ball should stay in the shaker when you add your Nutribuddy powder and liquid to the shaker. During the shaking process the ball bounces around and helps to mix your shake making it as smooth as possible.

For minimum fuss, simply leave the mixer ball in the shaker as you drink your Nutribuddy too.

If you watch the video below closely, you can see the shaker ball remains in the shaker the whole time.