The Ammeltz Yoko Yoko Adhesive Heat Patch provides non-medicinal heat therapy for back pain relief. It improves blood circulation, reduces muscle fatigue, and provides up to 8 hours of warmth. Ideal for those seeking a convenient and effective solution for muscle tension and discomfort. Key Features Non-medicinal heat therapy Thin and discreet design Provides up to 8 hours of relief Improves blood circulation Reduces muscle fatigue and stiffness Air-activated heat patch Odorless and convenient Key Materials: Non woven fabric patch; Iron Powder, Activated Carbon, Water, Vermiculite, Salt (generate exothermic heat through oxidation).Kobayashi: Innovators in non-medicinal heat therapy solutions for pain relief.Use On Clean, Dry Skin. Tear Open The Packet, Remove The Film, And Apply To The Affected Area. Activates Within 1 Minute, Heats Up Within 5 Minutes, And Provides Warmth For 8 Hours.Single Use Only.