Glass Tea Tumbler  Introducing a revolutionary way to steep tea - with this glass tea tumbler. The infuser chamber is made of crystal-clear glass, allowing you to watch the tea leaves unfurl as they steep. The double wall design keeps your hands safe from heat. The tea infusion chamber allows for the temporary storage of tea, making it perfect for on-the-go brewing. Made from premium glass that can withstand temperatures between -30 to 180 ºC (-22 to 356 ºF), this tumbler is able to handle both hot and cold liquids without cracking. Instructions on how to use the glass tea infuser : * Fill the small glass infusion chamber with your desired amount of tea leaves.