This stainless steel food grade tea strainer fits almost any mug with it's 4.33-inch width and 2.56-inch height. The extra fine mesh catches loose leaves and sediment easily and prevents tea particles from escaping into your steeped cup of tea. Simply place directly on top of your mug, add tea leaves to the mesh basket, pour heated water over, and cover with included lid/drip bowl. Steep for desired amount of time, lift and allow to drain over the mug, and then use the lid as a drip plate.