Glass Teapot Heat Resistant For Blooming tea 600ml/21oz， The products are made with borosilicate glass， adopting a low-expanding coefficient technology. The product has reached the international standard Grade A as well as the PYREX-7740 glass of CorningUSA. Item specificsDrinkware Type:Coffee & Tea SetsMaterial:GlassFeature:Eco-FriendlyCertification:CE / EU