Effective Roll Model Therapy Balls by Retrain Back Pain The Roll Model Therapy Balls by Retrain Back Pain provide targeted self-massage trigger point therapy. Shown here: The Roll Model Starter Kit, which includes all the balls: The air-filled Coregeous ball, the big Alpha, a toted pair of medium-sized Plus balls and a toted pair of the smaller, Classic balls, all contained in a black mesh tote. For more details visit our website. https://www.retrainbackpain.com/individualized-coaching