I'm selling one unused filter from a starter set, as I only used two. (Purchased July 2025) There seem to be various sizes available, so please check the official website for the correct size before purchasing (^^) - Product Name: Star Filter - Size: 297 x 420mm - Type: Disposable - Structure: Three-layer The product will be folded in half for shipping. It will be sent in an A4-sized envelope with minimal packaging (no cushioning material). Please be aware that the filter may have creases. Thank you for your understanding.