Core: non-toxic cooling gel， medical grade bio-magnet(20pcs)<br />Surface front: smooth velvet，<br />back: transparent PVC<br />Size:  around lenth: 64cm， around width 18.5cm<br />Net weight: around 260g<br />Using Instructions:<br /> To use your mask， remove any makeup. Place the mask over your face and attach the Velcro straps at the back of the head. Press lightly on the mask to move the liquid inner core to accomplish a custom fit for your face. Wear your mask approximately three to four hours a day， or while sleeping through the night. You should see results in three to four weeks! Do not allow any alcohol based products， such as denatured alcohol， makeup and facial creams， to come in contact with the mask. Be certain to rinse the surface thoroughly prior to use. Do not freeze or place in the microwave. To prevent drying， store mask in a plastic bag while not in use.