Been using these the last 8 years
Was recommended by my massage therapist 8 years ago, use it to do myofascial stretching and massage (especially my rhomboids, pecs, traps, glutes, literally anywhere).  It’s a good size and firm (which I love).  I purchased these to give to my massage clients who suffer from chronic pain.  Highly recommended. I do prefer this size compared to the smaller balls.
Rating: 5 stars