Important Note for Built to Last: Please clean and keep dry after useMade of 304 grade stainless steel, long lasting durability for a long time use. (The rivet is made of aluminum. Remember to wash and keep dry after use)Get the job done and easy to clasp shut, brew your leaf tea with easeHang the ball from your teapot or panhandle with the attached hook and is easily removable when your tea have fully steepedNow you can replace your old tea bags and enjoy drinking fresh full tea. (Not suitable for small tea loose tea!!!)