PET Film Cupcake Cases(https://www.cnlangmai.com/product/baking-paper-cupcake-liners/pet-film-baking-paper-cupcake-liners/) are made from polyethylene terephthalate, a type of thermoplastic polymer known for its strength and resilience. In contrast, traditional paper cupcake liners are typically crafted from waxed or unwaxed paper, which lacks the same level of durability. The polymer-based composition of PET film results in good tensile strength, making the cases less likely to tear or deform during baking or handling.