I use these at my esthetic salon and have had zero problems. They cool down to -10 degrees Celsius. Beauty clinics also use these! 500 M size fat freezing sheets, anti-freeze sheets ⚫︎Size: 27cm x 30cm ⚫︎Weight: 70g/sheet ⚫︎Quantity: 300 sheets I can offer them at a low price because I purchase them directly from the factory! They are consumables, so please use them at a great value if you need them. ※Other sizes, individual sales, and bulk purchase consultations are available.