Handmade Strings or elastic can be threaded through both sides. These are handmade items by an amateur, so there may be some stitching irregularities, distortions, and pin marks. I make them carefully, but please refrain from purchasing if you are looking for a perfect product. I use similar items myself, and they don't break even when washed in the washing machine. They are less likely to wrinkle if you pat them out when drying. 100 yen discount if combined with another mask. When packaging, recycled materials may be used for the outer bag. 3D mask Minister mask Box-shaped mask