100% healthy and environmentally friendly 100% food grade soft silicone, safe, BPA free, odorless and non-toxic. They are heat resistant and frost resistant from 230 C -30 C. Do not lose its shape. Can be adjusted to almost all types of cookware, oven, microwave, freezer and dishwasher. Set of 5 Lids Extra Large 30 cm, Large 30 cm, Medium 8 cm, Small 6 inches and Extra Small 4 inches. The lid can be used immediately on many containers such as bowls, cups, glasses, heat resistant glass, read foods, food boxes, cans. They are also suitable for mason glasses, mixing bowls. Keeps food fresh The silicone lid is a durable way to keep and keep food fresh and keep food longer and prevent them from freezing. leaks. The lid and rim of the pot should only be dry before installation. Easy to use and store Just place it on a smooth surface and press down for a perfect seal. Easy locking lid to save space and reduce clutter. The lids take up little space in the cabinet or drawer, and you can also hang them on a hook. Reusable and economical With these environmentally friendly silicone lids, it is easy to clean and therefore Reusable, expandable silicone cover replaces food wrap and aluminum foil, more environmentally friendly. More economical and more comfortable.