4 Patches 5.15 in x 3.31 in Providing effective Pain relief since 1934. For temporary relief of minor aches & pains of muscles & joints associated with arthritis, strains, bruises, sprains, stiff neck, sore shoulder, backache, and joint pain. The history of medicated patches in Japan reaches back to the 18th century. Hisamitsu inherited this tradition and has worked on improving it since the company was founded in 1847. Salonpas was first introduced in 1934 and is now available in over 50 countries worldwide. Salonpas launched in the United States in 1987 and has been gaining popularity ever since.