This mask anti-earache hooks is made of silicone. Due to the influence by coronavirus, mask become daily product now. The face mask ear rope magic buckle had three adjustable levels, suit for most of the people. Please put the ear hook on the two sides of your face mask, and adjust the 3 levels according to your need. The face mask adjustable hook are special with anti-slip groove design,which would not easy to fall down or move. Small but practical, super easy and convenient to wear. 7 11/16" L x 3/4" W x 1/16"