Glass lids for Centric containers. Glass is the most non-toxic material that exists, so this type of container is ideal both for storing our meals at home, for cooking, and for transporting them, since borosilicate glass does not transmit toxic materials to food and also admits being subjected to at high temperatures, low temperatures and a thermal shock of up to 150º. Separately purchased Centric containers include a BPA-free plastic lid and this glass lid. The Centric set of 3 containers does not come equipped with glass lids, so if you wish, you can purchase them separately. The glass lid does not close hermetically, it is used to preserve food and also for cooking. Centric containers can be used inside a pressure cooker with the glass lid. Diameter: 12.5cm small