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Thera PearlA New Degree of Relief®Pearls Change Color When: Hot or Cold17.5 In x 13.8 In (44.6 cm x 35.2 cm)Freeze + MicrowaveNon-ToxicDoctor Designed Hot + Cold TherapyConforms to the BodySoothing Relief for Pain + SwellingTheraPearl ColorSmart™ pearls change color when they achieve targeted Hot or Cold temperature.THERA°PEARL combines the healing power of HOT & COLD therapy into one convenient pack. Enjoy extraordinary relief from your everyday aches & pains and feel the optimal therapeutic benefit as our Pearl Technology® conforms to your body. Intended Use: Reusable therapeutic hot & cold pack for use with common aches pains swelling and bruising. Packs are designed to retain a therapeutic temperature for approximately 20 minutes.