Glass tea infuser fits in the center for loose tea and can be removed for making flower tea. They can be used over and over again to make the perfect pot of tea. Warmer sold seperately. A wire grid is included for use on electric stoves, the grid is not required for gas stoves. Always use medium or medium high heat. Dishwasher and microwave safe!! Company: Yancheng Glassman Arts & Crafts Co., Ltd.