This stainless steel mesh tea ball infuser is 2" in diameter with a 5" chain.  Place loose leaf tea in one half of the strainer (not full), close, latch, and place in your cup with hot water.  Let it steep for 3 minutes, or as long as desired. The fine mesh will strain even fine teas like rooibos. It is normal, when using ball strainers, for very small bits of tea to escape.