6 Cavity Hamburger Bun Mould Foldable Reusable Bread Mould ‑40℉ to +446℉ Heat Resistance Baking Mould for Kitchen. [Wide Heat Resistance Range]: The hamburger bun mould can withstand temperatures ranging from ‑40℉ to +446℉, making it suitable for use in freezers, ovens, microwaves, and more.