Each loose leaf tea infuser, large or small, is the right size to fit most cups and mugs. 
 
 Just open the small fine mesh tea strainer, fill it halfway with tea, place the ball tip into the cup, pour in hot water and leave to steep for 5-10 minutes or until the desired strength is reached.  For the larger infuser, just place 1 teaspoon of tea in the infuser and set the infuser in the cup of choice. 
 
Made of quality stainless steel, which is sturdy and safe, reliable and no odor, rustproof and reusable, not easy to break or deform. It is also convenient to clean, just throw it into the dishwasher, or you can wash it by hand, simple and easy.