CareStock Hot / Cold Pack General Purpose Large 17 X 27 cm Plastic / Gel ReusableHot Cold Pack CareStock General Purpose Large 6 3 4 X 10 1 2 Inch Plastic Gel Reusable Use hot and cold gel pack for therapeutic relief of sore and stiff joints, muscle tension, cramps, bruises, swelling, muscle spasms and pain. Designed to provide hot and cold therapy; delivers relief for different types of aches, pains and discomfort caused by different ailments Nontoxic gel can be brought to preferred temperature through microwaving or freezing.