For 21cm steamers! I usually use parchment paper, but I bought this after seeing that it's reusable. It's just a little bit small, but that little bit bothers me, so I haven't used it. Approximately 21cm silicone sheets for steamers, a set of 15 to improve steaming efficiency. - Quantity: 15 sheets - Diameter: Approximately 21cm - Application: Silicone sheets for steamers - Effect: Improves steaming efficiency Thank you for viewing.