Instruct: Classify the given Amazon review into its appropriate rating category
Query: Great muscle and tension relief in your neck!

I love the firmness and size of these massage balls. They definitely will provide much needed tension relief in your knots. I mostly got this for neck tension and shoulder blade knot, and just by putting pressure on the ball(s) on the specific area, it helps. Gonna have to invest on the track and and the block for the neck to get maximum relief. You do have to air them out for a couple of days, as they have a lingering plastic odor, but after that they are good to go as long as you watch the free training videos for proper use that are available online.