When you squeeze the handle - the "jaws" of this hungry hippo infuser open right up - ready for the loose leaf tea. This popular design is handy, easy to clean and small enough with the mesh that it prevents even rooibos from escaping into the cup.
Beware "cheap shop" imitations as low grade stainless can leach all sorts of nasties into your tea (we've once witnessed a rainbow like slick in tea steeped with a cheap infuser)
