The Protone® Lacrosse balls are an excellent way to loosen up those tight muscles. Roll over those knotted muscles for some trigger point therapy. These are great for those areas you can't quite reach with a foam roller. The Protone® Lacrosse balls are available in black or yellow. For some great examples on use, view this link http://www.youtube.com/watch?v=JVsA7imlm4Y Great deals to be had when multiple items are purchased. Not to be used on joints. All Bodycore fitness products are dispatched from the UK. Please check out our other items available for all your fitness needs!