Great for tight and painful muscles!
Great product! Was having pain and tightness in my neck, shoulders and back. Used the single ball against the wall and felt a major improvement. Not really sure how to use the roller, but I'm sure there's a YouTube video out there. Would have given 5 stars,  but the lack of instructions stopped that. There's an ebook, but it's not very informative. I highly recommend!
Rating: 4 stars