Made of silicone rubber Ideal as a substitute for plastic wrap in the microwave Also functions as an opener due to its rubber material Appropriate weight and soft material prevents food from breaking apart during cooking Good Design Award Winner MARNA is a manufacturer of household goods, with products sold in department stores and general goods stores nationwide. They were also featured on the TV program "Cambrian Palace" (Nikkei Special). Please refrain from purchasing if you are sensitive to the condition of the product or if you are looking for perfection, as individual perceptions may vary. Due to shipping considerations, packaging may be compressed or simplified, and recycled materials may be used. Thank you for your understanding.