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Please note: Built-in 108-piece magnets and nano-infrared thermal acupuncture point matrix quickly release heat with a long-lasting effect, effectively helping to improve blood circulation and promote blood circulation to relax muscle fatigue and relieve pain associated with joint and back problems. Features: 5 strong ABS removable solid molding plates help evenly distribute the pressure of your lumbar spine, with firm fixation and reliable support to maintain good posture and achieve certain body slimming effects. 3. Comes with a standalone neck strap containing 12 self-heating magnets, free to choose whether to wear it or not, the warm fabric can still enhance neck care.