Heliopatch Pain Relieving Patches may be used almost anywhere on the body to aid in pain relief. Available in packs of one, five, ten and twenty. The patches are designed with elemental magnesium and hydrogel electrolytes that provide electrons to the body. The patches provide neutrons that are intended to help negate free radicals in the body and promote healthy cell performance. Use the patches on your shoulders, neck, elbows, back, knees, ankles and feet