Tiger Balm Ultra Ointment provides fast and effective relief for: arthritis, strained muscles, back aches, sore shoulders, tired and cramped legs. It helps increase blood circulation of the injured areas and sore muscles; this helps carry away lactic acid (the main cause of sore muscles). Tiger Balm also has an anesthetic effect which helps numb pain. Available in 18 and 50 gram jar. The 50 gram size is popular for office use.