Stainless steel rings, inside made of transparent interlayer design, suitable for A4 size, both positive and negative sides can be used, suitable for up to 30 pages. The humanized design enables convenient use. The accessibility between the membrane and the middle allows you to change the content as you wish. polypropylene (PP) (non-toxic and non-radioactive). Durable and stylish. 32 x 25 x 2 cm (approx.). Adjust the folder. Ideal for all instruments and musicians. A great choice for music lovers. Product description Color: white Unique appearance with feel. With its creative, multi-layered A4 design that is hollowed out in the center, it is the ideal choice for music lovers. The wallet can be used on a variety of musical instruments and occasions. Suitable for the daily filing and storage of documents, sheet music etc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.