【High-quality Glass】 The DOPUDO tea cup is made of high-quality extra thick borosilicate glass, which is lead free, and does not contain any heavy metal or toxins. The material is heat-resistant and durable for everyday use. It can be placed directly in the microwave oven or on either gas or electric stovetops. It is extra thicker than other glass tea cup with infuser and lid.【Designed for ONE】 The glass tea cup with infuser and lid is designed for one. Working in the office with a cup of brewing flower tea, you can watch the whole steeping and may get excellent inspiration. The crystal glass strainer is uniquely designed to reflect the color of your tea. When it is empty, it's transparent with no color. When you are brewing your tea, the edge of the upside shows the color of your tea soup.【Heart Warming Details】 The cute glass lid is used to cover the mug when brewing tea and serve as a strainer holder after brewing. The ergonomic grasp handle is heat resistant and skid proof to make the tumbler easy to hold. The completely handcraft tea cup is extra thicker than other glass tea cups. It is durable to put in a dishwasher.【Value for Cost 】To critical tea lovers, steel or chemical coating have a bad effect on tea flavor. They usually use glass or porcelain tea wares to brew their expensive and precious tea leaves. Compared to porcelain, glass tea wares can preserve the best taste of tea and it is easy to watch the tea leaves brewing meanwhile they have a much lower cost.【No Worry Purchase】 We believe our tea cup is durable and sturdy enough for years of use, but there are so many facts or reasons out of our control, like shipping, packaging or other improper actions. Please don't worry about that. We guarantee that Whenever you engaged any problem, just contact us and we will give you our best support even if you don't know how to brew oolong.