These Flextone Pads can be used to cover larger muscle groups to provide quick pain relief. Use the Extra Large Flextone Pads for a more penetrating and more soothing massage. The extra deep relaxation effects will feel great on large muscle areas and relieve muscle tension, numbness and pain. Used for: - Lower back pain - Sciatica - Tendonitis - Arthritic pain - Sore muscles Set include : 1 pair extra large replacement massage pads+wires.