1. Material: silicone+PP 2. High temperature resistance: -40 degrees Celsius -230 degrees Celsius 3. Size: 350ml: 12.8x6.5cm; 500ml: 14x6cm; 800ml: 16x7cm; 1200ml: 19x7.5cm 4. Weight: 350ml: 107g, 500ml: 136g; 800ml: 165g; 1200ml: 215.8g 5. Features: high temperature resistance, foldable, strong sealing, can be heated in a microwave oven or stored in a refrigerator