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Hebei Hankai what is the purpose of oil seal

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    In addition to their practical benefits, portable back warmers also provide therapeutic advantages. Many individuals suffer from chronic back pain or muscle tension, often exacerbated by cold weather. The gentle heat produced by these devices can help soothe sore muscles, improve blood circulation, and promote relaxation. For athletes or individuals involved in physical labor, using a back warmer can serve as a preventive measure against stiffness and discomfort.