18 oz Single Wall Glass Tea Infuser. Made from borosilicate glass. Each mug has a distinctive colored glass handle. The mug includes our Tilt & Drip stainless steel comfort grip tea infuser. There is a silicone rim on the top of the infuser. The silicone makes it easier to grip and also keeps the infuser cool to the touch. The ultra fine mesh tea infuser provides excellent water flow and plenty of room for the tea leaves to expand and brew. The glass allows you to see the color of your tea. The glass lid doubles as an infuser holder. Easy to clean. Top rack dishwasher safe. The glass mug is microwave safe. Do not put the stainless steel infuser in the microwave. BPA free. Functionally and aesthetically this is a great tea infuser mug. Enjoy!