Made of High Borosilicate Glass It is a low expansion rate,high temperature resistance, strength,,hardness.Special glass material with high light transmittance and chemical stability,100% lead-free.High temperature resistance is its biggest characteristic, resistant to 180 degrees of temperature change. Compared with The Ceramic/porcelain Tea Cup/Teacup, It is Thin, Light and Transparent ① Beautiful appearance.High transparency, wonderful view in the cup, smooth surface, wear resistance, not easy to discoloration and fading; ② Sanitation.Glass is not easy to dissolve, can be used to hold any drink, not stale; ③ High temperature resistance.High temperature does not melt, does not deform. ④ HAND BLOWING HIGH QUALITY BOROSILICATE GLASS TEAPOTS: (without Lead, Cadminum, Arsenic and other Metals) Makes more thinner, lighter, capable of withstanding thermal shock, scratch, and break resistant, Create a Healthy Life. ⑤ STYLISH DESIGN TEACUPS: With glass lid and filter for loose teas or blooming teas. Just put the tea or coffee bag into the inner cup and add some hot water, then the inner cup releases infused tea directly into the outside drinking cup. The Advantages of Our Glass Teacup ✔▶The lid of the cup is thickened,It will feels thick on the hand. ✔▶The mouth of the glass is also thickened, which can effectively resist heat. ✔▶It can be heated over an open flame without cracking,Also can be used in gas stove, microwave oven, electric pottery stove, oven and so on ✔▶Pour cold water into it without cracking, and it can withstand a temperature difference of 180 degrees ✔▶You can make flowers tea, milk,loose tea, coffee and cold drink etc. ✔▶Very good choice in office, dining table, courtyard, tea room, outdoor use, easy to use and cleaning,convenient to carry. Hand Blown-Made by high borosilicate heat-resistant glass, very thin but pretty durable. Handle design, heat resistant, easy to carry.Can direct heat over an open flame.The glass teacup with glass lid and strainer,Perfect for loose teas or blooming teas. Capacity: 12oz(350ml). All-in-one design, perfect for home & office use. Nothing extra is needed to brew a perfect cup of hot&iced loose leaf/flower tea as well as bag coffee. Easy to use,Put loose leaf tea or flower tea into the infuser and add some boiled water. [ATTENTION] Small tea flakes may go through the strainer. Convenient & Clean-Place the removable strainer onto the bamboo lid for convenient multiple steeping and a clean table. REMARKING - Dishwasher, Oven, and Freezer safe; But in order not to affect the service life of glass products, our manual does not recommend the dishwasher.Not recommended for use with metal utensils, toothpaste can clean tea stains and other stains, and hand wash easily for its smooth surface. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.