Material: Polyester resin of the highest quality.
I am so happy with these fancy collar extenders I received from cochic. I used to own the metal cheap ones you can buy from amazon but they would always pinch my neck and also not go with the buttons on my dress shirt. Now not only does the collar extender look exactly like my shirts buttons but it doesn't pinch my skin at all. Shipping was also super quick! Two thumbs up!!