Thermal color changing belongs to physical changes, not a chemical reaction, therefore there is no harm to the human body. Dynamic and flexible,the borders can also be discolored by heat. Weights only 0.7oz,you can barely feel its weight. The color will change into pink when the temperature around over 28 degree centigrade and restore the original color after cooling. ALL-ROUND protection,shock & oil proof,comfortable touch with great mechanical strength.
