COLD & HEAT THERAPY RELIEF:Our massage roller ball is filled with cold gel,which can be kept cold or hot for a long time. Freeze our massage ball for 2 hours,you will get 6 hours of cold therapy,or immerse it in hot water for 10-15 minutes to enjoy 20 minutes of warm therapy.Say goodbye to the hassle of impractical ice cubes, cold packs. ALLEVIATES SORE MUSCLES: Excellent for reducing soreness on upper back, shoulder, legs, foot, neck, chest, and arms. Can be used in conjunction with massage oils or lotions. ELIMINATES FATIGUE: Can be used to perform a light or deep tissue massage after a long day to help eliminate fatigue from your muscles and relieve stress. PREMIUM QUALITY MATERIALS: This Massager ball is made with a premium quality, highly durable stainless steel and non-slip silicone base, guaranteed to withstand the test of time without rusting or breaking. PORTABLE AND EASY TO CLEAN: Fits in the palm of your hand and can be carried in your purse, briefcase or backpack.Can be washed with water and soap.