Manufactured in PBT, a plastic with glass fibre. Suitable for use in freezers and ovens. Lid with 4 lock system and silicon seal ensuring 100% leakproof. Transparent window to easily identify contents. The ceramic-plastic construction makes these containers more resistant than other plastic food containers and incredibly strong. They won\'t lose their shape or hermetic properties, even with intensive use in microwaves, dishwashers and freezers. The ceramic plastic has a more pleasant feel when eating from the container. Dishwasher safe: Convenience of easy cleaning. Freezer Safe: Store in a freezer down to -20°C. Can be used in a conventional oven up to 200°C (without lid on). Convenience cooking using microwave ovens. Dimensions: 195mm x 105mm x 50mm.