Glass teapot for tea makers. German Schott brand glass. Bottom measurements are 10cm-13cm. It can also be used in different brands and models with the same sole dimensions. Some tested brands and models for compatibility are: Fakir: Tea n more- Chaiwan- Tastea- Teatime Schafer: Optimal- Tea pleasure Sunny: Symphony Emsan: Handy Arzum: Ehlikeyf- JollieTea Philips: HD7304 Grundig: TM4961- CM1020 Beko: CM2940- Teaparty BKK2211 Arçelik: CM3940- K3281- 3280 Tiryaki Hotpoint Ariston: VMT JX0- VPL JW0- VPL JR0