Wu Yang Pain Relieving Medicated Plaster (3.9 x 78.7 Inches), 1 Can, SolsticeWu Yang Pain Relieving Medicated Plaster Apply this Chinese herbal medicated plaster to temporarily relieve minor aches and pains of muscles and joints due to simple backache, arthritis, strains, bruises and sprains. For the temporary relief of minor aches and pains of muscles and joints due to: simple backache arthritis strains bruises sprains. Active Ingredients: Methyl Salicylate 10%. Menthol 6%. Inactive Ingredients: Black Catechu Extract,