Made of food grade 304 stainless steel?? safe and durable. Safe size/capacity: 2.6 quarts (2.5 liters)</br>Whistle lid?? heat resistant handle. Un-insulated?? so it does cool down. Can not keep the water hot.</br>Heat condition: gas stove</br>Maximum water level hint line. Warning: Water level can not exceed the maximum water level line. If the water level is near maximum water level hint line?? please pay more attention to the kettle and turn down the stove with lower power.</br>We guara