This is a "KATI Cup" from Tea Forte, a double-walled ceramic mug with a stainless steel infuser. It comes with an infuser and a lid, making it easy to brew a single serving of loose leaf tea. The lid can be used for steeping the tea and also functions as a tray to hold the infuser after steeping. Please note that there is an initial defect, a chip on the bottom of the cup. Please consider this when making your purchase.