Made 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 ease. Hang the ball from your teapot or panhandle with the attached hook and is easily removable when your tea have fully steeped. Now you can replace your old tea bags and enjoy drinking fresh full tea. Small pieces of loose tea may fit through holes.