Pack of 4 Borosilicate glass : Highly heat resistant, the glass can withstand temperatures up to 300°C. Superior thermal shock resistance: The glass can be taken from your freezer at -20°C and put straight into your oven up to 200°C (without lid) Suitable for fridge, freezer, microwave, oven and dishwasher use. Airtight and leak proof plastic lid for easy storage and transportation with hygienic, removable seal for easy cleaning - BPA Free. Dedicated space on the lid to label contents, enabling easy identification. Lid suitable for fridge, freezer and dishwasher use. Lid not suitable for use in the oven. Hygienic material: Glass does not absorb or transfer food stains, colours or odours, it is long lasting, durable and scratch resistant, with a 10 year guarantee. Your glass will always look as good as the day you bought it, no more orange containers!!! Perfect for batch cooking, meal planning and storing leftovers. Ideal for transporting food for work lunches, picnics and dinner parties, with no leaks due to the silicone sealed, locking lid.