Roihi Tsuboko is a Japanese medicinal hot patch designed for pain relief. These round, beige-colored patches contain active ingredients like methyl salicylate and vanillamide nonylate that create a warming sensation to improve blood circulation. The coin-sized patches are specifically effective for shoulder stiffness, lower back pain, muscle soreness, sprains, and joint discomfort. With Nichiban's unique adhesive technology, they stay firmly in place during movement while remaining discreet on the skin. Each box contains 78 waterproof patches that can be easily applied to targeted areas.