Trudeau Stainless Steel Flip Single Mug Tea Infuser / Steeper (Green) Made of 18/8 Stainless Steel Designed to fit onto most size mugs (up to 4" diameter) Silicone ring ensures a perfect seal Turn upside down, the silicone lid forms a tight seal and becomes a drip catcher for a no-mess use! Available in three colors: Green, Orange or Raspberry