Material: Alloy. Inner Diameter: 1.7cm.<p> <b><b><img src="https://contestimg.wish.com/api/webimage/55b753f416f96140c0e9ee9e-large.jpg"><img src="https://contestimg.wish.com/api/webimage/55b753f416f96140c0e9ee9e-1-large.jpg></b></b></p>