Slightly larger than the original Yoga Tune Up Therapy Balls, the Therapy Ball PLUS self-massage balls measure about 2 3/4" in diameter and were developed by popular demand. They cover more surface area and add height to obtain a greater depth of pressure. Use them in their custom designed snug-grip mesh tote for spine rolls (top of the neck, down to the sacrum), as well as IT band & thigh rolls and so much more!  Pain conditions that can be improved with a set of Therapy Ball PLUS balls include TMJ/tight jaw, frozen shoulder, sciatica & back pain, IT band syndrome, migraine headaches and more.