6pcs Reusable Silicon Stretch Lid
Made of Silicon. Heat resistant to 450C
Microwave safe. BPA free
Environmentally-friendly: Unlike plastic wrap, baggies and other disposable storage items, these can be used over and over
They are made of durable, heat-resistant silicone that won't tear even after frequent use. They will retain their shape and ability for many years, and they are easily washed when dirty.