The price of the Cold Pain Relief Iron varies from brand to brand and is about$30 to$50. Cold Pain Le Iron has the effect of soothing the tendons and activating the blood, and is used to treat back pain. It is used externally, once a day. When using it, shake the drug several times to loosen it sufficiently and expose it to air. When it feels hot to the touch, it is placed in a fixed bag and covered over the pain-affected area, and each bag produces heat for not less than 15 hours. If there are lumps in the process of heat production, use your hands to gently rub them apart. This drug is for external use, not to be taken internally, and is contraindicated for pregnant women and those with broken skin.