Tiger Fitness Lacrosse Ball /Double Lacrosse Ball/Spiky Massage Ball/Peanut Massage Ball /Muscle Roller Lacrosse Ball with carrycase for Thoracic Spine - Upper Back Neck Scapula etc B Double Lacrosse Balls are used to restore normal range of motion to the thoracic spine. No need to tape two balls together any more as the Peanut Massage Balls comes ready for you,this double lacrosse ball helps restore suppleness to your spineu to use It allows you to zero in on one segment of the vertebra that might be the major cause of restriction for your entire back. Works well on upper back, neck and scapula - the thoracic spine,Comes with Lifetime Warranty and Free Carrying Bag. A Portable, Durable & Easy to Clean Mobility Tool that helps relieve muscle, neck, back and joint pain