Joe's USA Lacrosse Balls - All Colors (also used for Back Massage Ball Therapy) (Yellow, 1) Joe's USA Lacrosse Balls - All Colors , Vulcanized rubber, Colors: Yellow, White, Orange, Red, Blue, Pink, Violet, Multicolor. (also used for Back Massage Ball Therapy) Works great for massaging out trigger points/muscle knots, Lacrosse Balls work wonders for back pain, Lacrosse Balls work great for back massage, Lacrosse Balls work great for dog toy balls *Always consult your doctor before trying something new.*Always consult your doctor before trying a new back pain treatment. *