Chu Kiang Brand Extra Strength "Hua Tuo" Medicated Patch temporarily relieves minor aches and pains of muscles and joints due to simple backache, arthritis, strains, bruises and sprains. Formulated using a proprietary blend of herbs with menthol and camphor to offer quick relief for sore muscles and joints. The Chu Kiang Brand Extra Strength "Hua Tuo" Medicated Patch last up to 12 hours. Apply this herbal patch on a clean surface on the body. Avoid sensitive skin, open wounds and face. 6 patches per box, over 60 hours of relief per box! Outdoor and indoor use for adults and children.